Top Definition
When a group of naked guys form a circle and then spin in circles so their boners slap each other.
*thwap* *thwap* *thwap*

Stupid Kid: "Dad, what's that noise coming from upstairs?"

Dad: "Oh, that's just our ligger line! Wanna come join us?"

Stupid Kid: "Yeah!!! YAY!!! Woohoo!!!"
by Matt Markel November 28, 2009
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