Atomic Situp: The act of convincing someone that he/she cannot do a sit-up with the prankster holding a towel over his/her head and pulling forcefully in the opposite direction. Another friend puts their exposed ass by the knees of the person doing the sit-up. The prankster then lets go of the towel which forces the person doing the sit-up face first into the rear of the third friend.

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Submitted By Gavyn