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tank slapping 

The act of a man using his penis to penetrate another mans anus in a dodgy style so that there semen tanks slap together. Hence, 'slapping tanks'.
Bob and George have been togther for 6 years now. Not my idea of fun mind, not really one for tank slapping.
tank slapping by Christoph October 26, 2005

Tank slapper

The aftermath of a very rare and extraordinary poo. A tank slapper requires the coming together of a unique arrangement of circumstances not encountered on a frequent basis.

Firstly the poo being ejected must be firm, ideally smooth, definitely not sticky and have some elastic properties.

Secondly the body from which the poo is being ejected, must be longitudinally centred and slightly forward on the pan. The sphincter must not be too slack or overly encumbered by anal beard, this is to ensure maximum velosity on exit and reduce any parasitic friction.

If these properties are met, the poo will launch out of the anus. It will hit the forward side of the pan, adjacent to the bowl water. Ricochet on to the back pan, leaving two perfectly vertical skid marks in front and behind the bowl water. This is a tank slapper.
Jeff, Jeff, my legs are trembling and I feel like I’ve been touched by the almighty himself. JEFF, I’ve had a tank slapper.
Tank slapper by Cludgyspanklips September 26, 2021

Tank Slapper

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.
Tank Slapper by dj_monged August 15, 2004

Tank Slapper

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...
Tank Slapper by Christoph November 9, 2005

tank slapper

I got a new bike! Wanna ride tank slapper?
tank slapper by Jimmetry December 11, 2011

Tank slapper

Tankslapper is when a car has sudden oversteer due to many different conditions depending on suspension or drivetrain setup.

One possible origin for the word is old WW2 tank crew vetetans taking careers as racing drivers during 1950s and dubbing the natural effect of inertia as a "tankslapper" as the weight of a tank usually centered around the rear due to storing ammunition.
"A nice save from Senna from a massive tank slapper at the European grand prix!"
Tank slapper by NaggerNick September 30, 2022