When a girl sits on your penis and proceeds to spin

N. A loose toilet seat likely to slide left or right while seated upon it, sometimes sliding completely off the rim of the bowl. A tilt-a-whirl can be particularly dangerous for men when the seat slides too far and pinches off the sexual organs during defecation.

The act of shitting in ones clothes dryer, then turning it on. Best when the dryer if full of clean laundry.

Hook up with a girl, then using the time it took you to finish as a countdown, find another girl and hook up with her.