Top Definition
The Semi Truck is when you nailing a girl from behind ( the floor works best)
and you reach undr like your gonna grab her tits but instead you throw your arms out andit hers causeing her heard to slam on to the floor and then you slam her adn hard as possible adn she will it her head on the floor several times before she can get back on her hands
i felt like driving the semi truck today so i drove my chicks head into the floor
by kgyuyu March 04, 2009
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