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The sound heard when a man's ball sack smacks against a girl's pussy or taint area while he fucks her in the anus. The harder the penetration the louder the clapck. As well as the looser his testicles are, the better the sound effect.
Girl: I love the clapck when your testicles smack my twat.
by t0nydehtigeh October 10, 2010
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