Skip to main content
Urban Dictionary Merch
Your favorite words on things you can wear, drink from, read, or give to a friend.
The Urban Dictionary Store sells gifts you’ll have to explain.

Prices in USD. Free US shipping. International shipping and regional book fees are shown before payment.

Often confused with love, this is the feeling that a particular woman is actually special. This is just an illusion; she is the same as the other three or so billion. "Go fuck ten other women" is the most commonly prescribed treatment for this "disease" (hence the "itis"), as it tends to show quite quickly how very alike people are.

In other words, get over yourself and your obsession with that girl, because it's just an illusion. And when you get rejected, don't be depressed. Because there's really not much to worry about.
Dude, you definitely have oneitis for that girl. You've been talking about her nonstop for the past week. Don't you realize she's nothing special, and that you are just being fooled? Snap out of it so you won't be so depressed when she rejects you!
oneitis by Fuss December 1, 2004
Related Words

onevision 

People with only one vision or less (0).
People that can only see one thing or in most cases lacking vision completely.
A "onevision" therefore steal visions from others in most cases.
A "onevision" can also be called a "novision".

Picture of a "onevision" character:
http://bayimg.com/caPkGAabF
"What a onevision!"

Meaning: what a stiff vision lacking piece of shit moron,
or:
One of those vision lacking thief's.

"O no, another onevision!"

Meaning: someone stole our invention, again...
onevision by Señor Bazura April 29, 2009
Sweet, smart, intelligent girl. She doesn't take anything(bullshit) from anybody, and so special that anybody will be lucky to have her. She always has something to say about everything which most times are true and she is very athletic. She is one of a kind. :) ;)

She also got a big booty
Anna: "Wow I wish I was Oneisha"
Susy: "Same"
Oneisha by Smexyy May 7, 2017
Mickey Black's definition is fucking retarded.

There is only one simple explanation for the term: An unhealthy romantic obsession or fixation for/on one person. This mental disease will often interfere with your ability to attract said person, due to your clingyness.
I'm suffering from oneitis because I have a massive crush on that one girl who works at that one store.
oneitis by Sroek July 8, 2010
An unhealthy romantic obsession with a single person. Usually accompanied by un-reciprocated affection and completely unrealistic idealization of the siad person.
John, snap out of your oneitis man. She's not into you.
oneitis by _AtoZ_ March 8, 2010
The name of the decade from 2010 to 2019. We've had the noughties, and after 2020 we will have the twenties, so this has to be the most logical name for the one between.
Man: I've had some fun during the noughties!
Other Man: Yes, just think what fun we could have during the oneties!
Oneties by Little Computer Nerd December 8, 2009
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
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
Load more