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A really athletic person, always going above and beyond. Extremely fit.
Guy: Did you see that girl? She's so fit! How does she do it all?!

Guy: She's a Firlie. They are the fittest people i know.
firlie by akf.2 October 18, 2016
Related Words

Mrs Farlie

Mrs Farlie is the depute head of a catholic school, known to be the whore of Mr Phee, she sits in his office a lot, moaning for his 'holey blessing'. If seen, do not confront and instead ignore the loud moans on behalf of your sanitu.
There's that Mrs Farlie, moaning her fucking head off again...
Mrs Farlie by Dr Anonycunt March 13, 2019

Fillie depression 

Fillie depression is when you Look at Millie Bobby Brown and Finn Wolfhard having “moments” together. These “moments” include non stop glancing at each other, Heart eyes, hugs, and the blushing and giggling while talking about The Mileven kiss ( On the show Stranger Things). Signs of having Fillie depression are watching fillie edits all day, internal crying, and constantly talking about Fillie with your friends and how it may have been real.
I was watching Fillie edits today and now I have Fillie Depression
Fillie depression by @wazowskifinn February 16, 2018

fillies and gentlecolts

Most prominently used in Lauren Faust's reincarnation of My Little Pony show, Friendship is Magic, and its fans who call themselves bronies. It is a pony-speak for "ladies and gentlemen", or more appropriately, "boys and girls". It is related to somepony, anypony, everypony, etc.
"Fillies and gentlecolts! As mayor of Ponyville, it is my great pleasure to announce the beginning of the Summer Sun Celebration!"

-Mayor of Ponyville, The Mare in the Moon pilot episode.
fillie is the best FRIENDSHIP there is (finn wolfhard and millie bobby brown)

:)
omg they act so much like fillie
Fillie by strangerthings2 June 6, 2018
fairlie is an amazing person with alot of beauty, she is very pretty to and nice and loves all her friends alot!
i wish i was like "fairlie"
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
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