An invitation for sexual activity involving the repetitive flailing of one man's flaccid genitals, specifically the scrotum against the skin between your ass and your penis, with the intention to make a revolting yet beautifully natural mating call for all males in a radius of 10 metres to hear. Frequently used in a variety of locations from gay orgies to bromances.
Brynn: What's that slapping?

Tom: It's Connor. He's in his bedroom practising the Magic Frog for tonight.

Brynn: He sounds pretty good.

Tom: I know. Tonight's going to be great.
by 3dslover March 09, 2014

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