This farm almost did not make the list, since every YouTuber and farmer alike has beaten it to death since it first appeared sometime in 2012.  There are so many videos on this spot, that it's hard to to stumble across one, even while searching for something completely mundane, like chicken wings or golf clubs.  Anyway, you want to pull the entire instance without aggroing any of the bosses, and if your a skinner you an make slightly more gold by skinning the hides.  Generally this farm is being phased out by the lvl 58 twilight outpost farm, and with good reason.  It's better and does not require you to enter the instance.  So more drops for you!  Not sure, why anyone would pick this spot over the latter unless you were really interested in increasing you skinning level.
Mists of Pandaria has a few rare mobs that drop epic BoE’s. Most are in Krasarang Wilds and most drop leg slot gear. Scritch is also very good as you can get the Hozen Peace Pipe from him. The best way to farm them is to occasionally check if they’re up and kill them all in the order listed below. That way you basically just fly through Krasarang Wilds with a short visit to Townlong Steppes, The Jade Forest and Kun-Lai Summit
Awesome trick really.  In this farm we'll be taking advantage of game mechanics to exploit a way into getting more defias loot drops.  The defias leggings and gloves have respective selling prices of 3,000g and 14,000g and only drop from 1 mob in the instance a staggering 1% of the time.  But do not fret, we can get the upper hand on this.  Much like past drop-combat farms, if you kill just one of the two defias overseer's in the instance, THEN drop combat, the one you killed will instantly respawn.  The trick here is to bring a character that can consistently drop combat and score many more kills than the average farmer.  To date, a hunter is best – with night elf being slightly better because of shadowmeld.  You can also bring potions of invisibility to boost the effect.  Anyway, while the average farmer only gets 1 shot to get these super rare xmogs, with this method you can get up to 40 chances in an hour.  Seems fair right?
Finding the best route for you can be a bit tricky because of the size of the dungeon. I will usually only do about half the dungeon, killing as many mobs as I can in 6 minutes. After 5 minutes, make a group in the group finder and leave it. That will leave you a minute to complete your 6 minutes and you will be ported out on the 6-minute mark, ready to reset and port right back in.
Awesome trick really.  In this farm we'll be taking advantage of game mechanics to exploit a way into getting more defias loot drops.  The defias leggings and gloves have respective selling prices of 3,000g and 14,000g and only drop from 1 mob in the instance a staggering 1% of the time.  But do not fret, we can get the upper hand on this.  Much like past drop-combat farms, if you kill just one of the two defias overseer's in the instance, THEN drop combat, the one you killed will instantly respawn.  The trick here is to bring a character that can consistently drop combat and score many more kills than the average farmer.  To date, a hunter is best – with night elf being slightly better because of shadowmeld.  You can also bring potions of invisibility to boost the effect.  Anyway, while the average farmer only gets 1 shot to get these super rare xmogs, with this method you can get up to 40 chances in an hour.  Seems fair right?
The vanilla WoW Horde leveling guide you see on this site was originally made back in 2006 by Joana (AKA Mancow, or FuriousPaul).  The guides have been tweaked many times over the years to make things "faster".  The leveling guides were made because of all the messages I got from people asking me how I was able to level up so quickly on new realms.  I was first to level 60 on 7 different realms (3 with Mancow and 4 with Joana), even winning Blizzard's "First to Level 50" contest they held back in 2006.
Okay, this farm is by far my favorite old world farm.  Generally because discovering this spot is like finding a hidden gem that the developers do not want you knowing about.  The thing is, everyone talks about farming zul farrack by pulling the entire instance... Nope, the real gold is made by flying over zul farrack...  If you fly over zul farrack until you reach the large steps that begins the usual third boss scenario, you will find that there are literally 50 trolls just hanging on the steps and another 25 just sitting at the foot of the steps.  It's an amazing scene, as all these trolls have ACTIVE level 40-45 loot tables.  Each and every one of them can drop cloth and mogs from the mid level era of items.  Whats more is they don't take too long to respawn.  ALSO they are not affected by the 7.3 transmog nerf because they ARE NOT in an instanced zone.  Making this spot the BEST transmog spot in the game IMO.  Check it out in the video, it's really awesome.
I made some route changes to the Horde levels 43-44 sections.  I have swapped 44 Dustwallow Marsh with 44 Desolace (the entire sections). This allowed me to do Deadmire (at lvl 43 instead of 38) and then go stop at TB to turn in Deadmire + The Black Shield at the same time, then fly quickly to do the Desolace stuff.  Doing 44 Desolace is now mandatory because I think its faster with the new routes. This will also make the level 53 grind much shorter.  I think these were great changes.
YouTuber Oldbess recently uploaded a video about this cool method.  Generally completing the scenario "Deaths of Chromie" will allow you to pick up the item "Time-Lost Wallet" in excess.  You can get it from just killing the mobs or actually completing the scenario in full.  By then end you will have dozens of time lost wallets.  Each wallet awards 50g AND a rare chance at getting the ]bronze proto-whelp[/U] pet.  In the video, this spot was VERY hard for to pull off as it requires a high item level.  With an 809 item level I struggled all throughout the scenario and could not make this spot profitable for the time invested.  The good news is, if you can get it done, the gold you make will be entirely liquidated – the rewards are 50g raw for each wallet turn in.  I suggest you watch it on Oldbess's channel for full details.
A farm that I myself made drastically popular about 2 years ago.  This farm is a simple pet and transmog spot that requires you to pull the entire wailing carverns instance.  Besides how it sounds, this farm is VERY easy going and can literally be done while you watch something else entirely.  (netflix maybe?)  While it's not as potent as it used to be, it still has some merit in it, especially if your server is low on the deviate hatchling pet.  While it does take some time to drop, I can usually average  a deviate hatchling every 30 minutes or so.  However, since I released the video on it, the price of the pet has dropped wildly.
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