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When your buddy slams on the vehicle brakes when climaxing in the back seat with a partner. Causing the unbeknownst partner to clench their orifice while a significant and uncontrolled thrust is applied. Causing your seed to shoot as if flung from a sling shot. Very similar to the donkey punch but with the added thrusting jolt.
Hey man, we're going to lie down in the back. When I give the signal give me a brake pedal, will ya?
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by 1tank99 January 07, 2018
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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