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Reproduction joke. The "1+1" refers to two people having sex; the extra 1 represents a potential baby, making a total of 3 people.
"I'm gonna get laid tonight!"
"Whatever man, just remember sometimes 1+1=3."
1+1=3 by progamer124 January 4, 2005
Pregnant.

Like one guy and one girl=one guy and one girl and one baby.
So, what happened last night?

Well: 1+1=3.
1+1=3 by youmeatsixfanatic February 22, 2011
1+1=3 so yes
1+1=3 by LOCALMEMER March 22, 2023

1+1=Fish 

in the korean geometric system it is believed that all things mathematical are equivalent to a food product. this was later enforced by ninja58 and believed throughout the entire mmorpg unvierse.
ninja58: what does 1+1=?
noob: 2?
ninja58: wrong its 1+1=fish you stupid noob!! sux0rs
1+1=Fish by JoseGuzman September 22, 2008
"a husband and a wife form a union". Usually seen on yokel t-shirts.
I'm With Stupid --> 1+1=1
1+1=1 by duggie October 28, 2003
being sad to close a chapter
but also happy to open a new one
its what happens sometimes in life
and so many have gone through this before me
its manageable achievable desirable
I cannot think of anything making me happier
and i am aware that there is no guarantee for a result as in 1+1=2
but i like to think there is
đź–¤
1+1=2 by KrkiÄŤ April 3, 2019
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
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