there is a quest ( Helboar, the Other White Meat - Quest - World of Warcraft ) , where you get a mixture to apply to the meat to Purify it, but there is a chance when you apply the mixture to the meat for it to become toxic and unuseable for the quest. to get around that, just use hellboar meat untill you get a pure one, collect another 8 pieces of hellboar meat, split a stack of netheweave or something so your inventory is full, when attempting to purify the meat, you will get "Your inventory is full" error message when trying to purify the meat, if you simply make a space in your inv by putting one cloth stacked back up move the meat to new slot or break the stack of meat, to fill your inv again, then use it, you cant get the purifyed meat instead of toxic meat, made this quest around 3 min max for me normaly would take alot of time say 10 min to get all 8 meat...
not an exploit i dont know, but meh, just thought i add it, its only 1 quest, but its 3 min work intead of 10 min for 10000~ xp