When someone slaps you in the face to give you a taste of the full-blown fight that is about to erupt.
Paul: Did you watch 30 Rock last night?
Steve: That show is stupid.
*Paul gives Steve a slappetizer, and then proceeds to beat the crap out of him*
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When you think you're about to pass gas, but instead you have explosive diarrhea. This is a more severe form of sharting.
Suzy: Wasn't Jim wearing different pants this morning?
Karim: Yeah, but the food from that sketchy hot dog stand gave him unexpected fartarrhea and he had to change.