Top Definition
A name given to someone who often has shit that will make you want to fall over and die. They have to poop within five minutes of eating, no matter the location. Their poop is deadly. Rankypoo should have a sign that says hazardous. Occasionally poops while playing checkers and talking on webcam.
Dang, that's some rankypoo girl.
by dooey91 July 27, 2009

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