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To backflip and change direction at the last moment. To have a firm plan and then drop it at the last moment
I had everything booked for our holiday and my girlfriend did a magowan at the last minute.

I was driving down the road and next minute this idiot did a maGowan right in front of me
magowan by ATM4 January 27, 2022

McGowanJoying 

The act of eating your female partner from behind before going doggy style to finish
Man I had so much fun Mcgowanjoying that slut last night
McGowanJoying by BC1969 January 28, 2022

shane macgowan 

By far the best Irish-born (he was raised in England) punk rock musician EVER. Don't dispute it; you looked him up for a reason.
Just youtube Shane Macgowan or the pogues; thou shalt be more than content. Dirty old town is an excellent song to listen to when drunk.
Tiocfaidh ár lá.
From the Jamaican dialect.
Meaning: Friend, mate, brother etc
Man 1: Magwan! Its been a while!
Man 2: It has, how is it going magwan?
Magwan by PreachingBrother December 5, 2010

John McGowan

A guy who's probably gay and stuff. I bet he likes swiss cheese and octopods
That John McGowan guy is probably gay and stuff. Bet he likes Octopods.
John McGowan by UWasAtTheClub March 29, 2019

rose mcgowan 

A very awesome chick from Charmed. Oh yeah, she dated Marilyn Manson and wore a see-through dress type thing to the VMA's.
Rose McGowan is a cool person.
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
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
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