Top Definition
The sound of a penis slapping against the inside thighs as you twist hips quickly side to side in a rotating motion.
I won the thwocking contest by making the loudest sound! My penis is such a champ!
by rat fastard March 20, 2006
The act of having sexual intercourse. Comes from thwock, meaning erection. Noun
Marco and I had a nice thwocking last night.
by Jopeck January 10, 2004

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