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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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pretty much anything u want
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.