Knee Slapper 

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*

Knee Slapper by lovelyleftorgan777 May 4, 2022

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

The Slapper 

Will Smith

The Slapper says "Keep his wife's name out cho' fucking mouth!"

The Slapper by Vomit is my business October 9, 2022

Tank slapper

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

Tank slapper by NaggerNick October 11, 2022

Ground Slapper 

Huge floppy feet that slap the ground as you walk.

"bro got them GROUND SLAPPERS!"

Ground Slapper by MostLIkelyMe April 8, 2023

pp slapper 

Somebody who finds big pp (or just pp) funny and are a true big pp. They are also a very incredible sussy baka.

(Side Effects include: Amogus Syndrome)

"pp"
"you are a pp slapper"
"that amogus is be lookn likes a pp"
"yep. pp slapper."

pp slapper by pp slapper May 9, 2023

Sand slapper 

A hand job but instead of lube they person uses sand and spit

My girl gave me a sand slapper on Daytona beach at night and I got a yeast infection but it was great

Sand slapper by The mans dictionary June 23, 2023