What is Costello Clapp?
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A Costello Clapp is when after coitus, instead of cumming in or on your partner, you cum into your hand and proceed to smack them in the face with the handful of cum.
After I was done having sex with Melyssa, I costello clapped her across the face.
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As quoted by the oh so famous Welsh Rappers The Goldie Lookin' Chain, or GLC
Youknowsit clart.....