Top definition
It's when one sticks their penis through the American-Mexican Border and another person inserts the penis in a body opening.
(Guy sticks penis through border)
(Woman puts penis in her vagina)
Border Patrol Guy 1: What are they doing?
Border Patrol Guy 2: It's called border sex.
by AFuckingMotherFucker November 22, 2011
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The vengeful act of crapping on a lover's chest while they sleep.

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