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Pretty much the same as merk or slew. It is the act of inflicting extreme damage either lyrically or physically to another boi. From the verb to slew, but with "age" stuck on the end to make it seem more gangster. This type of terminology (the use of "age" on the end of words, in this case "slewage") was popularised by gangbangin Brit mc Mr Wong in his riddim "wongage", and is commonly used in virtually every endz of da L-O-N.
"Yo bludclat, break yourself, i'm about ta draw for da slewage up in this bitch"

...Booya!...(Gunshots are heard)
slewage by MC Blitzkrieg February 24, 2007
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tapping the sewage line 

to place ones penis in he anal cavity of another
after there one year anniversary, sam is tapping the sewage line.
tapping the sewage line by stylies September 15, 2010

mississippi sewage plant 

When a female is receiving oral sex, rumbles forth with an almighty example of flatulence, and holds the rug muncher's head in place to bask in it's full flavoured glory.
Man 1: I went down on a girl for the I think 3rd or so time.. she purposely farted and held my face there.

Man 2: Ah yes. The ol' Mississippi Sewage Plant.

Sewage Booty 

Where you sit down for long periods of time and you get up and you notice your pants sticking to your butt and a pungent odor.
I was sitting down for an exam and I noticed I was showing signs of sewage booty.
Sewage Booty by kelly girl September 10, 2009

Tribal Sewage

The widespread sharing of complete bullshit through social media. Via repetition and popularity, tribal sewage generally becomes accepted as fact despite its obvious inaccuracy.
Dude 1: Check out this awesome new muffler I just installed on my Honda Civic. My friends say it will give me at least 20 horsepower.

Dude 2: Where did you hear that, on the forums? They're spewing so much Tribal Sewage, I'll bet you get 5 horsepower MAX out of that fart can.
Tribal Sewage by Scooter12ga October 27, 2010

Sewage Tsunami 

A phenomena unique to Gaza in the middle east, where a cesspool releases its contents into the streets flooding entire villages.
Also known as a Palestinian "River of Sewage".
Get out the waders Mohammed, here comes another sewage tsunami.
Sewage Tsunami by Capt. Diggs April 2, 2007
The stream, sometimes violently projectile-like, of today's (or yesterday's) semi-digested consumption. It's made possible by sickness, food that didn't agree with the stomach, that last tequila shot (that you knew you shouldn't take but didn't have the will to disrespect by leaving undrunken), seeing poor souls wearing white after Labor Day (bless their little hearts), thinking some heinous disgusting thought, other sensory overloads like witnessing or smelling other spewage, or anything that makes you vom. In sum, the upper body counterpart to sewage, but expelled from the mouth.
We were having a great time, had some food and drinks and were all set to hang out for the night, but she got a spewage leak and ended up decorating the side of the car with her lasagna. Game Over.
Spewage by GR-44 January 26, 2021
More from Urban Dictionary

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
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026
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