Definitions by Cacophonous Mischief
Impossible Situp
When someone (a male) is passed out on their back, you take off your pants and stand with one leg on either side of their torso, with your bare ass in the direction of their face. You then punch them in the groin with a degree of force, and they will sit up abruptly, getting a face full of your bare ass.
Impossible Situp by Cacophonous Mischief January 25, 2010