When you put chalk on your hands when your lifting weights and you go to the bathroom and whip out your dick and you get chalk on it.
Man i gotta piss. Dang it! I got Chalk Dick!
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To scrape someone's penis on concrete in broad daylight.
"You know what? I'm gonna Chalk yo dick bruh." "bro got chalk dick yo." "Bro got Chalk in his dick!"