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The act of shaking or flapping a man's genitals until they make a clapping noise. Usually done in groups to see how loud of a clap one can get, also for bragging rights. Only done in groups after calling the requisite, "No homo."
Yo dude, Scott is the loudest British Clapper!

I know man, I wish I could clap that loud!
by NewEnglandSteeze December 17, 2008
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