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.

Blue boy 

A poetic way of saying “sad boy.”
“It’s blue boy hours.”
Blue boy by Rosaax February 10, 2019

Project Bluebook 

The last publicly acknowledged USAF investigation into UFOs, which started in March 1952. Its aims were to find explanations for UFO sightings, to assess whether they were a threat to national security, and to determine if the UFOs used advanced technology from which the US could learn. Reports were collected, analyzed and filed according to their results. No-one noticed anything was wrong with the project until one of the people on the investigation team sent in his own sighting. It was filed, but when he wanted to refer back to his report, it had disappeared. He then alleged that any reports that were both unexplained and could cause public uproar were siphoned off out of Blue Book to somewhere else higher up in authority, a claim that ufologists now see as fact. Blue Book was wound up in 1969 as a result of the Condon Report and one of its investigators, Dr J. Allen Hynek, went on to form the first scientific based UFO group, the Center for UFO Studies, in 1973.
After closing Project Blue Book the US
Air Force has not publicly acknowledged any further interest in UFO sightings.
Project Bluebook by ufologist February 6, 2005

Bluebook 

"A Uniform System of Citation" used during law school. Commonly referred to as "bitchbook" and is often the bane of law student's existence. Law Reviews often employ the Bluebook citation metho.
My professor requires that I learn Bluebook citation for my appellate brief although it is completely different from the citation method I will use after I graduate from law school.
Bluebook by lawpunk March 4, 2009

Tabbed Bluebook 

1. A copy of "The Uniform System of Citation" carefully annotated by a law student seeking a position on Law Journal.
2. A book whose owner should shampoo a crotch.
"This campsite is rad, too bad it has no shower."
"Not to worry -- Mads has a tabbed bluebook."
"Really? Sweet."
Tabbed Bluebook by HarrierPride March 26, 2008
A condition, similar to blueballs but applicable to women, in which the genital area is flooded with blood for so long without release that it becomes painful. Can be both a noun and a verb, and used literally or figureatively.
"I was totally going to do it with this guy last night, and we were all making out and what not, then he left, and now I've got a nasty case of bluebox."

"Considering the way the White house owns Congress right now, Harriet Miers is gonna feel totally blueboxed if she doesn't get confirmed."
bluebox by Cosmo October 4, 2005

Bluebook Bob 

A person who is very difficult to work with. One who is demanding and unreasonable, quick to place blame without first researching the facts. A person who does not care about the feelings of others or of the consequences their words and actions have on others. They find it easier to blame someone than to find out the root cause of the problem or ever admit they may be at fault. Their behavior may be attributed to the lack of oxygen to their brain from the constricting outdated mom jeans that they tend to wear.
It would be better to bang your head on a wall over and over again than to hold a conversation with Bluebook Bob.
Bluebook Bob by Tired of Bob March 5, 2012
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
Load more