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1.
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.
von John Stewardson 17. Januar 2004
 
2.
A rapid side-to-side oscillation of the front wheel of a motorcycle, where the handlebars literally 'slap' the gas tank due to insufficient road grip on the front tyre.
He had a tankslapper coming out of the first bend
von larry arizona 23. April 2006
 
3.
The pillion passenger on a motorcycle.
I got a new bike! Wanna ride tank slapper?
von Jimmetry 13. Juni 2011
 
4.
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.
von dj_monged 15. August 2004
 
5.
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...
von Christoph 26. Oktober 2005