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adverb. a synonym for the word definitely. used to express complete agreement or strong affirmation.
guy #2: dude you wanna come to my party, it's gonna be super sick!
guy #1: defferson!
Defferson by Brent Handles January 23, 2009
Related Words
deffers by steve and ryan August 8, 2005
m is short for most or mos
m deffer is most definately
mos def is m deffer because deffer is short for definately
m deffer by 99pl April 24, 2007
Dufferz - my nickname, my name being Sam Duff.

Also commonly used to say damn, dufferz loves his milf! lol
Boy, that Dufferz is so hawt!
Kerry fancys Dufferz
dufferz by Sam Duff December 15, 2008
deeferz a word that is a noun. people have this noun as a nickname; specifically, you must scream this word (possible outcome: undiagnosed adhd). Deeferz refers to a person who is an amazing show-stopping individual who is optimistic and has an amazing form of humor that is unmatched by the other individuals around the world (the other 8,096,244,733 people). anyway, deeferz could be a verb that you can refer to as deeferz; come here, look there, etc. This word was solely created for peace and harmony in the world.
Advised to use this limitedly because it's an ancient and amazing word (terms and conditions apply). *u might turn acoustic*
"omg look its deeferz" (screams the name).

Another example: *walks around a block* "DEEFERZZZZ"
deeferz by deeferz March 11, 2024
deeferz a word that is a noun. people usually shout this word (possible outcome undiagnosed adhd). Deeferz referred to a person is an amazing show stopping individual who is optimistic and has an amazing form of humor which is unmatched to the other individuals around the world (the other 8,096,244,733 people) anyway, deeferz could be a verb which you can refer to as, deeferz; come here, look there etc. This word was solely created for peace and harmony in the world.

Deeferz can be used as any word ever created.
Person 1: *entering a room filled with people* “DEEFERZ”
Person 2: *sitting in the room shouting back* “DEEFERZZZZ”
deeferz by deeferz March 26, 2024
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

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
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