Top Definition
When one is the fourth person in the back seat of either a 2/3 seater car. The thigh slammer is the action of the fourth person not being able to fully close the door due to their thighs stopping the motion of the door. Resulting in a thigh slammer.
"Hey man, we're well not gonna be able to fit in that cruiser"
"Don't worry man 4 can fit in the back easy"
"Aww man I got a thigh slammer, i'll walk!"
by Creb salad May 02, 2010

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