To have sex. see HORIZONTAL MAMBO
Once, I was listening to a friend's horizontal bop... it made me laugh so hard I crapped my pants.
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They only ever thought about who was doing the horizontal bop with who.
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When the male is laying down behind the female and he sticks his penis into her vagina. Then the male thrusts his pelvis causing a "bopping sound". The two people are laying horizontally while doing this action.
Last weekend i was horizontal bopping the shit out of this chick
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