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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

Duffers' Syndrome 

A slang term for the very serious medical condition duphershypertrophy whereby the sufferer acquires over time excessive fatty tissues to the nasal region, giving the patient the not unpleasant features of a gnomish looking fellow; rosy cheeks from the strain of holding one's nose up all day, at times somewhat gormless facial expressions (which can be attributed to the drag-factor but more often can lead an innocent bystander unaware of the condition to conclude that the sufferer is possibly some sort of simpleton) and of course the ever-expanding, bulbous nose which grows and grows like in that fable about the enormous turnip...

Prognosis: Not good; rhinoplasty recommended.
What are you doing resting your nose on that snooker cue? Have you got Duffers' Syndrome or something?
Duffers' Syndrome by Mouldy123 April 3, 2011
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

delferson 

He is a bright boy. A good friend. Tall asf & would make anyone’s day better by a wave of his hand. Delferson is weird but in a fun way. He means everything to his friends. I don’t know if theres other Delfersons but i cherish mine. Delfersons are amazing, funny, and caring & someone you don’t want to live without. If you come across a Delferson KEEP THEM IN UR LIFE
someone: Omg he’s so funny
me: He’s Delferson
delferson by cherrypoptartg October 20, 2020
a totz radder awesomely awesome way of saying definitely.
:)
jeanine: cherie is totz smelly
cody: defferz
defferz by Jeanine Howton June 27, 2008
1. An expression to refer to those Americans who live unexciting or unexotic existences. Typically used by truckers, construction workers, or others whose livelihoods aren't geographically dictated.

2. Boring middle class white people who live in suburbs.
Sam: All they do is bitch about their commute.
Bob: Of course. They're duffers. That's what they do. That's their biggest problem.
Duffers by mathias83 March 12, 2008
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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