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Urban Dictionary

Three accepted meanings:

1 A unit of brightness of nebulae. A nebula is a cloud-like object visible in the night sky, using a telescope or binoculars; think milky squished star. It - a Crab - is, by definition, equal to the brightness of the Crab Nebula, which was seen as a supernova in 1054 A.D., by Chinese and Arab astronomers; also known as the nebula M1 (Messier1).
A Crab has a sub-division millicrab, which any half-competent student of the metric system will be able to tell you is a thousandth-part of a Crab.

2 A hard-shelled crustacean, with a body generally wider than it is long, two pincers, and a wide variation in size, ranging from pea-crabs, about the size of the eponymous vegetable - to spider crabs, which have a claw span of three or four metres/yards in large (= old) specimens.

3 Pubic lice. This indicates that you may not have been too careful aboutyour fuck-buddies.
1 The new nebula is about five hundred and twenty millicrabs - say half the brightness of the Crab Nebula - said the little blonde astronomer; plainly, she didn't seek to sensationalise this new discovery.

2 Crabs can be caught in many coastal waters - but be careful picking them up, as they can nip.

3 'That damned soccer-jock gave me crabs - he must have shagged Brutus last week!' said Pandora with resignation, whilst counting her plentiful takings.
Crab by railtracksurvivor May 1, 2009

pre-flight shit 

A mandatory shit you take at the airport, before boarding the plane. Because you don't wanna drop a load in those cramped nasty-ass airplane bathrooms!
Hey Steve, I just took my required pre-flight shit. No way in hell I'm using the bathroom on the plane to drop my load!
pre-flight shit by LonePooper February 1, 2018

Main Vein 

The large vein that travels the length of a cock. Instrumental in delivering blood from the central artery during erection.
My cock was so hard, my main vein was swollen with blood.

I saw my heart beat as the main vein of my cock pulsated with blood.
Main Vein by Tony from the Lido September 21, 2011

mommycation 

The time a mother gets to herself, when her children are away for an extended period of time.
My mommycation is over! My kids are coming back from spring break at grandma's.
mommycation by Maricusa March 26, 2009
I PLAYED FORTNITE PLSKILLME
PLSKILLME by THEZANYIESTGAMER January 25, 2020
An act where someone with a colostomy bag lays down on their back and allows their partner to insert their penis into the colon hole for sexual gratification
Alex decided they wanted to T-Bone with Jay for the first time 8 months after the accident, when they finally felt more comfortable with allowing things into their colon hole.
T-Bone by Wallop-A-Gallop August 4, 2021

Skanky Muniz 

Skanky Muniz is a female rapper/porn star who starred in such films as Agent Jody Skanks and Mal Comes in the Middle alongside Jizzy McGuire
Skanky Muniz fucks shit up on the daily. She said she was dating Amanda Bynes but it’s bullshit. That makes her a Big Fat Liar
Skanky Muniz by Dig Nitty May 26, 2019
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