1 definition by Niglet12345

The term used to describe riding in/with the traffic of a busy street very quickly on a bicycle. A verb that usually consists of many other verbs, such as riding, biking, cursing, yelling, swurving, giving the middle finger, speeding etc.
Lets MASH down Broadway, im in the mood to yell.
by Niglet12345 April 21, 2009
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