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1.
Gift Hijacking is when you put your name on someone else's gift either because you forgot to get a gift or because you were just to lazy to get one.
Gift Forgetter: *eyeing the table of gifts* Hmm....from Erica? *scribble scribble* and Ashley.

Party-goer: Hey! That's gift hijacking!
by Kittiefied November 21, 2012