A sudden oversteer in a car caused by the rear-end being unsettled in a corner. Usually happens if the accelerator is pressed too hard or too early on corner exit. May be unpredictable and needs delicate steering and pedal work to correct depending on severity

Term is originally used in motorcycling, but is used interchangeably with cars and racing
Tarquini had a massive tank slapper on Copse corner and lost quite a lot of time before Maggotts and Becketts
by NaggerNick October 11, 2022
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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!"
by NaggerNick October 1, 2022
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/nē/ /slapper/

Noun

1. A joke; typically a pun or otherwise regarded “Dad-Joke”, the humour of which prompts an audible slap-of-the-knee from one or more of the parties involved.
Ron: “So me and the wife were down in Mexico last month, and she twisted her ankle at Salsa Night”.

Gord: “Oh no, what did you do?”

Ron: “I called ‘Nine-Juan-Juan’”.

*Audible laughter and slapping-of-the-knee*

Gord: “Jesus Murphy, Ron, you really had me going there for a second. Now that’s a Knee-Slapper”.
by be4nz1111 August 20, 2023
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A saying a person does when another person says an unfunny joke but you're being sarcastic about it, indicating it was the funniest joke you have ever heard in your life. (being sarcastic if you didn't get that)
"Hey Billy, why did the chicken cross the road?... TO GET TO THE OTHER SIDE!" *laughs hysterically*

"What a knee slapper, Timmy!" *slaps knee*
by lovelyleftorgan777 May 5, 2022
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Something so hilarious it makes u slap your knees. Funny moments that cause uncontrollable laughter.
My niece and I seen a man with a car dealership flag on his bicycle chased by a bunch of Chihuahuas, it was such a knee-slapper!! Hahahaha
by MainRain October 14, 2018
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When you cut your knees off and slap your partner with them
I was having a bad so my husband gave me a knee-slapper
by Unifart April 2, 2021
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When someone thinks that you fancy them, yet you ignore it and pretend you like them, yet slag them off behind their back with something extreme yet likley, damaging their street cred and chances of having sex with anyone in the future.
"I'm gunna slapper poach that Ho, I cant believe she caught herpes after sucking off that tramp for a taste of his special brew!'
by AnonM April 25, 2008
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