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.
by John Stewardson January 17, 2004
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When the fuel in a vehicle hits the inside of the tank hard enough to shake it, nearly always cause by making sudden, unplanned turns. Tank slapping is a symptom of bad driving.

Many cars use special baffles to help reduce this.

Can also include the rider's legs on a motorcycle.
Leaving the last bad corner on Snake Pass I missed the apex and over corrected. When the tank started slapping I thought I was a dead man.
by dj_monged August 15, 2004
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see 'Tank Slapping'. The art of anal sex with a man in a doggy style.
Goerge is gay. He is a right tank slapper, he likes being tank slapped balls deep...
by Christoph October 26, 2005
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