Top Definition
The act of pulling apart your butt-cheeks and putting them on a knee while you have violent diarreah. The knee will block of the diarreah and make it fly in every direction.
One time, when I was little, I was sitting on my my mom's lap and I accidentily gave her a Knee Stopper. Whoops.
by Octavio Hermendez October 13, 2006
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