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The atomic bomb that was dropped on Nagasaki in 1945.
The Fat Man and the Little Boy was one of the many stepping stones toward the Cold War era.
Fat Man by Ian22 December 7, 2006
bat man, as a fatty. offten misstaken as an over weight middle aged man. also see ramen.
da na na na na…FAT MAN!

quick, ramen! to the fat mobil!
fat man by illyria June 24, 2007
The largest jug (3 leitres) of wine by Carlo Rossi
Yo, you wanna race to kill the fat man tonight?
fat man by CharlesA December 28, 2005
The greatest fart ever dropped on a populated area. It was so stinky that it killed over 200,000 people. It was made after death went to Taco Bell back in ‘45 and took a beam and cheese burrito. It was dropped on Nagasaki and ended WWII with the biggest boom at the time.
Person A: “Dude it smells like shit hear what happened?”
Person B: The US just dropped Fat man on Nagasaki if you go there you’ll die from the stink.”
Fat man by KumonBoy69 April 16, 2021
large individual who despite appearance is extremely agile. Often appears sexy for some unknown reason
Yeah, I'm a fat man, deal with it.
fat man by mr. Q June 9, 2004
An extremely full colostomy bag .. (after the Nagasaki Bomb)
My colostomy bag filled up so much last night, I woke up with the biggest Fat Man. If that thing exploded the shit would really hit the fan.
Fat Man by justafleshwound2 January 22, 2018
More from Urban Dictionary
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
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
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