Top Definition
When you are having sexual based relations with your significant partner, and you tease her by inserting and uninserting your cock into her vagina over and over. This is similar to the game peek-a-boo but is followed with a slimey substance discharged from the penis.
therefore; cock peek-a-boo
Derrick: Yo, dude.. last night me and michelle played some crazy cock peek-a-boo!
Optimus Prime: Your mom's hott..
by Kyle's Killer Lemonade August 15, 2008

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