Placing one's testicles on the back of someone's head and then letting your penis drop in a clapping motion onto their forehead and possibly chin, depending on the penis.
Me: "I totally Cock-Clapped James last night!"
You: "What's a Cock Clap?"
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Originating at UC Berkeley, clap cock is when you jerk off so many times over the course of a 1-2 week period that you temporarily can not get or maintain an erection. The cure to clap cock is semen retention.
I knew in advance that my date wasn’t gonna put out so I said fuck it and gave myself clap cock.
When you snipe some one with your fat cock in face.
Brian was tight at Mario and told him to Clap Cock.