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short for Retard Units, that is a unofficial synonym for "imperial measurements". As the rest of the world use metrics, the internet culture started mocking the medieval traditions of the Americans.
I'm 188cm tall, that's 6'2" in R.U.
R.U. by Alseimik March 5, 2018
It's the short version of 'are you'.
Chris: R u going out tonight?
Amy: No.
R u by YourFriendChris September 15, 2020
Rest up. Used slang word abbreviation for rest in piece.
“Yo heard my man got done,, tell him i said R.u bro”
R.U by not_t October 18, 2020
Is a person who is fast as fast to fuck a girl and have a normal dick R.U. is good boy good in cooking lovely boy and such a handsome boy from Philippines.
Yo, r.u. is a legend mate
R.U. by Joriax June 9, 2021

r-u-n-n-o-f-t 

The condition of having left or abandoned someone or someplace, often abruptly, under difficult or unpleasant circumstances, and with the implication of not intending to come back. Colloquial misspelling of "ran off." The term is derived from the movie O Brother, Where Art Thou, in which an rather unlearned character wishes to convey to other characters that his wife left him but does not wish to say so aloud in front of his son.
Mrs. Hogwallop done r-u-n-n-o-f-t.
r-u-n-n-o-f-t by Edward January 6, 2004

R U RARTED 

The smart way to call someone retarded

This insult trumps all comebacks including but not limited to

No u
reverse
I know you are but what am I ...etc
Guy 1: Ur Mom Gay
Guy 2: No U
Guy 1: R U Rarted
More from Urban Dictionary
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
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026

Respectfully 

Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.

After school, The Modells on Jamaica Ave was active. Respectfully.
Respectfully by john quan the first December 20, 2020
Word of the Day on September 26, 2026

You met me at a very Chinese time in my life

A moment in time where you feel distinctly Chinese over all other things.
Dante: "I wish I could be Nigerian, but I can't because I'm Chinese. You met me at a very Chinese time in my life."
Word of the Day on September 25, 2026
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