Definitions by John Stewardson

tank slapper

When a motorcycle shakes its head. The front forks going from lock to lock.

He got into a big tank slapper and stepped off on the high side.

tank slapper by John Stewardson January 17, 2004

high side 

When a motorcycle throws the rider off going over the handle bars.

He got into a tank slapper and went over the high side.

high side by John Stewardson January 17, 2004