kack

An injury on the shin typically recieved during mountain bike trials. Caused by the pedals ripping flesh from the rider.

Dude! Check out this gnarly kack I got riding yesterday!

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clean

To perform a stunt perfectly while involved in an extreme sport such as mountain biking, skiing, snowboarding, etc.

Bro! I just totally cleaned that double! I thought I was gonna biff and splatter my brains all over the pavement!

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