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Also "hop up." Used when referring to airsoft guns. It is best described as the backwards spin that the gun is designed to put on the bullet, making the bullet spin the wind below it during "flight" so that it doesn't descend as fast. A lot of airsoft guns have too much hopup, so the bullets might travel upwards at times.
Crap, this gun sucks. It has too much hopup.
Sweet, that gun has just the right amount of hopup to shoot straight.
by coleProtocol May 04, 2005
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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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