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1.
A 180-ollie on a surfboard. A common maneuver that has been played out recently at a professional level. Can also be performed while windsurfing
Quit braggin about your chop-hops bro, they've got no style.
by Joe Wonder October 12, 2006
 
2.
A technique for maintaining large amounts of speed in half-life by repeatedly crouching very quickly. It's very difficult to execute without a script. Also refered to as "chopping."
That medic chops so fast!
by b0b October 23, 2003