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Popular term among cruiseship crew with multiple meanings:
1 Drinking "bottoms up" style
2 Hitting something / someone
3 Getting beaten / smashed
4 Finishing the job quickly
5 Cutting / chopping something
6 Rough sex
7 Breaking rules
8 explosion
many more related meanings
and sometimes: it just means Shlack
1 Got some Vodka from under the counter. Wanna Shlack?
2 I just wanna Shlack the babalu across the face!
3 The wawes were Shlacking the side of the ship all nite
4 Lets go guys, shlack shlack so we can go to crewbar
5 Shlack - Shlack - Shlack need say more?
6 SHLACK YOU!
7 Listen, stop shlackin around ok?
8 - - - = = = x x x S H L L A A A C K K ! ! ! x x x = = = - - -
Shlack by alacartouche April 24, 2014
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boy i will shlack u
shlack by kw,gukyr March 27, 2019
Rhymes with Skelack but is totally unrelated. This is a practice where the victims asscheeks are closed shut with Plaster of Paris. Usually the outcome of returning a car with less gas then when you left, /q'ing during an epic raid or hitting on a guy that one of your friends is after. (See sleepover)
"Oh god, vapor lock!"
Shlack by Ezrielli February 12, 2003
A sound used in scat singing that one yells when they can't think of any other sounds.
"Be bop bum dadum dee shooby- SHLACK!"
Shlack by Liar Hendrix November 21, 2016
"wow that's shlack bro"
Shlack by wildfairy7 July 1, 2023

shlack clack kachoom 

the sound of a round being chambered in a shotgun and being fired
The duck goes...QUACK, QUACK!

The cow goes...MOOO!

The shotgun goes...shlack clack kachoom!
shlack clack kachoom by E April 7, 2005

Shlack Lack 

A person who makes up words.
Gosh, Wayne is a liar, he's such a Shlack Lack.
More from Urban Dictionary
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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