Gift Hijacking
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!
Party-goer: Hey! That's gift hijacking!