Top Definition
A protruding limb which hangs over the ball sack, otherwise known as a penis. Used daily for the purposes of: urination, masturbation, mushroom stamping, swaffling, gagging, painting, penetrating, projecting, and finally primping.
When Kyle got home he asked his wife Carroll if she would kindly suck his twankus.

Zain prefers for a woman to pay excessive attention to his twankus.
by guccizain November 15, 2013
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