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2.
Taxing your friends or partners by taking a portion of they're meal.
Friend 1:"Hey you just jacked my fries!!!"

Friend 2:"I didn't jack them! That was Friend Tax."
by L33TNINJ4Gurl October 19, 2009
 
1.
The things you do out of obligation to friends in your life with no tangible expectation of payback.
Person 1: "Man, why do I have to invite Sheila's loser boyfriend? It's my damn party."

Person 2: "Suck it. Friend tax."
by any name will do February 11, 2007