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Originates from the SED and subsequently the Perl construct for a regular expression substitution: s/REGEXP/SUBST/ will replace whatever matches REGEXP with SUBST. Commonly used in chat contexts by people with a Unix background and/or wannabe hax0rs to either correct their own previous typoes, or change the meaning of somebody else's statement.

Many people also tend to drop the final slash, either because they're lazy or because they don't really know where that expression comes from.
A: trance music sucks
B: s/sucks/rules/
s/ by DJMoses May 27, 2009
Related Words
S • S.A.L. • S-A-T • S.O. • s.t.p. • s'more • S.E.A.L. • s.t.m. • S&M • S.A.W.
you're stupid.
s by retroz October 23, 2020
s
s
s by dimetrisaurusrex May 10, 2019
4chan's "Sexy Beautiful Women" image board. Possibly the greatest place for a man (or lesbian) to be.

You can find almost ANY picture of sexy women, to almost underage to swim suits to even the (boring) beautiful face threads. I mean this from the bottom of my manly soul, they have the SEXIEST pictures here. It may take a little bit of searching to match your tastes, but it is MORE than worth it. I mean it when I say I've never faped so much in my entire life.

I'm basically a newfag to 4chan, but from what I've seen it has a fast post rate. Unlike other boards, 4 out of 5 times you will go in and come out very satisfied. Hardly any disturbing images from what I've seen.

I think the best things on the board are the high concentration of amateur pics (good for those who are tired of fake pornstar pics) and the huge, high definition pics for that high quality fapping experience. And hey, if the thumbnail doesn't look good, then you don't have to click it.

So if you don't want to pay a subscription to some expensive porn site but still want a huge variety of sexy pics of women, hop on over to /s/. Lurkers and regulars alike LOVE it and I have to admit most of the women on here are GORGEOUS.

A browser of /s/ is called an /s/perv. HOORAY FOR /S/PERVS!
Well... really, there is no such example of /s/. You have to witness it for yourself.
/s/ by Flood_Master3 June 23, 2009
Added to the end of a word to make a singular possesive (or sometimes a plural possesive with words whose plurals do not end with S, such as people) or a contraction with "is" or "has". Poorly-educated people/foreigners tend to use it for plurals and verbs, but that usage is incorrect.
-Correct-
Bob's cat is black.
Bob's going to the store.
Bob's gone to the store to get his cat some food.
------------
-Incorrect-
Cat's are fluffy animals.
Bob has a cat that overeat's.
's by GastonRabbit October 19, 2004
The /S is known as the sarcasm switch. When you are typing a post use it at the end of your post so people know you are actually being sarcastic.
One good thing about you being wrong is the joy it brings to others. /S

It may be that your sole purpose in life is simply to serve as a warning to others. /S
/S by Techie714 September 24, 2011
More from Urban Dictionary
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
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026
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