when a male thrusts forward so quickly, his dick and balls slap against his stomache, causing a "clapping" sound
Sarah: At Lisa's party we dared Steven to happy clap for a beer and he did it..twice!
by chandramukhi January 23, 2008
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(for males) when the balls slap together with the thighs of your leg.
may happen when u shake your leg
by Philip March 25, 2005
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A rather disturbing trend in Britain today. It involves being happy slapped by someone who has the clap, and who has recently rubbed their fishy bits with their hand.
Pete: "Cor blimey Jimmy, why ave you got a face like a dogs arse?"

Jimmy: "I just got happy clapped by a transvestite, I'm still in shock"

Pete: "Jesus, this happy clapping is getting out of control"
by Roob40 May 30, 2008
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