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1.
Term generally used used to show appreciation to someone after they have done a deed for you.

It can also be used as a sarcastic way of saying "thank you" to someone after they have done something that you don't like, or that inconviences you in anyway.
Example 1:

Mike: Here goes that five bucks I owed you from yesterday.

Chris: Appreiciate you.

Example 2:

Sara: Matt, I think I gave you herpes.

Matt: Thanks a alot bitch. Appreciate you.
by Mr. Gaines February 14, 2012