Before we get started on the wall o' text, I should mention this method only works for fast-attack melee fighters: Rogues, Windwalker Monks, Fury Warriors, Cat Druids and my favorite, Enhancement Shamans. The only other restriction is you need to be Revered or higher with the Klaxxi.
Step 1: Talk to this guy, Skeer the Bloodseeker, and get his Enhancement, called Raining Blood. Pick up an augmentation as well. I like Speed King from Ka'roz the Locust.
Attachment 11112
Step 2: Proceed to the Horrid March. Start either at the Serpent Spine wall (where the big, dead bug is) or under Kypari'Ik (the sha-twisted tree thing).
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Step 3: Kill everything in between the aforementioned points. The Raining Blood enhancement stacks on your target with each attack, and when it reaches 8 stacks, stuns all nearby enemies and deals 200,000-250,000 damage to your current target (usually killing it). Pick a stunned target, rinse, repeat. A fast melee dps will get the 8 stacks before the stun wears off (or pretty close), enabling you to take on large groups or elites very easily.
Step 4: Go kill something else while the bugs in the Horrid March respawn. I've estimated their respawn at around 7-8 minutes. Nearby are two very fertile meat-farming areas. A little further away are some other meats. Pick one and kill for a few minutes. The Raining Blood buff kills things really quickly, and the Speed King buff knocks down the time between targets signifigantly.
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Step 5: Return to the Horrid March and wipe the place clean again, then back to farming meat.
Within an average hour of farming with this method, I would normally get 50-60 motes of harmony, 7-9 stacks of meat, 35-45 Dread Amber Shards, 150-300 gold worth of grey junk, and 10-15 greens. I've also picked up three "MoP-leveling" blues.
A couple of tips
1.) Don't burn all of your short-cooldown attacks on one target. As an enhancement shaman, I hit each target with either Stormstrike, Lava Lash, Flame Shock, or Unleash Elements (or Lightning Bolt, if Maelstrom Weapon is fully stacked) and let Windfury do the rest. The stun lasts about six seconds, so if you put too many attacks on one target, the stun can wear off while you're throwing white swings at your target.
2.) Haste. Lots of Haste.
TL;DR: Get Raining Blood Enhancement. Farm Horrid March and surrounding areas. See above for details.