Double fisted thigh slapper 

A penis so large it involves having to use two hands to hold it/masturbate that also slaps the thigh while naked.

Also called a DFTS.

Damn dog, women must run when you bust out that double fisted thigh slapper you keep hidden away.

Jeff walks funny due to his double fisted thigh slapper hanging low.

Double fisted thigh slapper by DoubleFistedThighSlapper January 29, 2019

Shit fucking slaps 

When something is so good, that good isn't a good enough word.

This shit fucking slaps.
Have you heard her new song? Shit fucking slaps.

Shit fucking slaps by _ashiix August 14, 2020

Kappa Slappa

Preteen– or teenage girls obviously experimenting with there image – The Kappa Slappa “Look” consist of trainers – Kappa tracksuit bottoms – an Elise jumper. This is generously accessorises with cheap looking jewellery – most of which is purchased at Elizabeth Duke of Argos. Hair is worn up in (see Corydon Facelift) – and makeup is plastered on to hide any spots blemished and love bites.

Kappa Slappa’s are usually found in groups of 3 or more – although one will occasionally break from the pack. This type of behaviour usually occurs when the Slappa in question is attracted to a male of the same species (see Tezzer). This liaison will, in the least, result her being “fingered” behind the local nightclub – however the usual outcome is pregnancy – and alas further drain on the UK’s benefit system.
See also:
Mouth Breather
Klassy Lassy

Lad A: Word round school is that Tracy will suck you off for fifty pence!
Lad B: Which one is Tracy again?
Lad A: You know the Kappa Slappa two years below us!

Kappa Slappa by Andy The Great July 22, 2003

slapping the black man's knee

To masturbate vigorously.

Friend 1 : "Hey, why weren't you out last night?"
Friend 2: "Sorry, I was slapping the Black Man's knee.

slapping the black man's knee by SwigglesMcGiggles April 7, 2015

Your Slaphappy Grandpappy 

A term made up by the 'Diary of a Wimpy Kid' used asa 'Your Mom' joke.

Substitute teacher: Greg, can you answer this problem?
Greg: Your Mama!
Subsitute tecaher: Excuse Me?
Greg: Your Big Fanny Granny!
Subsititute Teacher: Well I hardly think that's -
Greg: Your Slaphappy Grandpappy!

Your Slaphappy Grandpappy by middle_school_'lOsEr' December 30, 2009

Slapass Friday 

Any given Friday when people choose to run around slapping anyone and everyone's asses. Usually, a male slaps a female's ass, and it's automatically considered okay for no reason other than the boy has proclaimed it "Slapass Friday."

BOY: *slaps girl's ass*
GIRL: What was that for, you prick?
BOY: Slapass Friday!

Slapass Friday by Rachel Retardation December 1, 2006

slapgat 

Word originating from Afrikaans meaning "lazy". Often used to denote persons such as teenagers, a person not pulling his/her weight - a lazy ass (lit.)

That guy is a real slapgat when it comes to completing the paperwork, he never does it on time.

slapgat by Charl Heydenrych February 19, 2007