Top Definition
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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to trip ,re-up and be in ecstasy generall when someno takes lotta drugs
oh damn nigga stop frontin u hop up everyday takin my fuckin chronic!!!
by pitelis August 07, 2006

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Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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