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Refers to a form of natural contraception called the pull out method but in this instance when the male is nearing ejaculation intead of pulling out his penis like he and his partner agreed, he slaps her tits and ejaculates deep within her
Jenny: "How on earth did you get pregnant"
Jacky: "My boyfriend preformed the art of coitus interslaptits perfectly "

Boyfriend: "Coitus interslaptits?" Also means
Girlfriend: "Coitus interslaptits!" I love you
by RhinoIV November 12, 2014
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