Top Definition
What the dried cum on your penis becomes if you don't clean it all off. May also be dried precum. (or a dirty cock)
I hate to wear black underwear because sometimes i have cockchalk and it marks my underwear up.
by agrafos April 26, 2010

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this is the white residue left on your clothes (usually inside your jeans) from 1-3 day old jackoff semen that you forgot to clean and now has become a chalk-like powder that kinda flakes off when you scratch it with your nail, wondering what it is...
Ernie, this cock chalk all over your clothes is out of control!!!! Please son, stop jacking off so much.
by 777geez November 20, 2015

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What you call it when you write on something with your cock after you bone some chick on her period.
after i did lauren last night i marked her up with some cock chalk.
by Chuck Bucket February 18, 2005

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the residue left around the outer edges of the lips after giving felatio
nicole was giving shawn a blow job and had some cock chalk left on the edges of her mouth
by lakeguy March 20, 2009

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