A whip is a maneuver performed on a motocross cycle, usually during supercross or motocross racing, in which the rider brings the rear of the motorcycle abruptly around to either side. This is performed while the machine is airborne off a jump. In very extreme whips, the rear of the motorcycle will end up perpendicular to the direction of travel, in addition to the motorcycle being laid flat. The purpose of the whip is primarily threefold: To show off, to alter the trajectory of the bike in flight, and to scrub speed over jumps. Some riders would say that whipping helps them maintain rhythm on the track.
Did you see that crazy whip that Bubba just threw down!? Sick!