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A sex act in which a man will recline the drivers seat of a car, then a woman (or another man, if thats how you roll) will proceed to get on top of said man and drive while engaging in the act of sex."
"Dude is that a sling for your cock?"

Ya, we got rear ended while doing the booster seat, no pun intended."

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by YouSick&$#@ March 17, 2010
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2
A guy with a huge ass which is disproportional to the rest of his body.
All the girls love Jordan because he has a booster seat.
by da black flame July 03, 2008
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