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costello 

someone who is very immature and sarcastic at times, but ultimately funny in being so. This person also has sadistic ways of going about things, but can be very serious about certain things. Costellos always push people to do their best. They are also very soft on the inside, and may disguise liking you in forms of teasing and sarcastic comments. All in all, Costello's are very beneficial to have in your life if you know their rules and play by them.
My swim coach is such a costello, but he's the best coach I've ever had.
costello by someswimmer333 April 4, 2009

Costello 

The innate desire to take over the world with sick and/or humorous plans.
"Jason has a serious costello... he is demented. Its all about power with that guy"
Costello by Xondak July 8, 2006

Costello 

See also Obsessed, Fanatic, Zealot, Cult Classic and Cult Movie
Someone who is completely obsessed with some sort of cult fiction (Example: Lost, WoW, Star Trek, Napoleon Dynamite, Family Guy, Halo, Star Wars, Pokemon etc)
Guy: "Man, Chris is really into Lost"
Girl: "Yeah, like he is Costelloed to it"
Guy: "That's pretty strong to say he's Costelloed"
Girl: "Well, he spends hours researching all the literature associated with it"
Guy: "You're right, he is a total Lost Costello"
Costello by [<ABSENT>prodigy] July 8, 2006

Costello 

One whom is hot and very sexually attractive. Usually those who call others Pretty boy
Johnathan, you are such a Costello. I wish I could of been as good looking as you are.
Costello by londontiger23 June 26, 2023

Costello 

Your go to mid if you’re looking for to protect your pockets! Ranked NUMBER ONE MID - THREE CONSECUTIVE YEARS IN A ROW
Just use Costello’s drop bro
Should’ve loaded Costello but instead you got headache

Shout Costello he’s always Gara side regardless
Costello by Vision eye January 9, 2024

Costello Clapp 

A Costello Clapp is when after coitus, instead of cumming in or on your partner, you cum into your hand and proceed to smack them in the face with the handful of cum.
After I was done having sex with Melyssa, I costello clapped her across the face.
Costello Clapp by Josh Doane June 25, 2006
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
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