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Just a random insult. Combining "Fart" and "Ass." Or accusing one of passing too much anal gas. Not an insult to be taken to heart, however. Fun times.
"Hey, John, how about you stop farting, you fartass."
fartass by Troy McGrath July 31, 2003
Putting your butt-hole on a dolphins blow-hole
Did you just fartass that dolphin?
fartass by awesome darkness March 23, 2009
a person (especially with lactose intolerance or IBS) with a huge ass that farts all the time
timmy: hey, billy! stop being such a fartass! you’re gonna stink up the whole classroom!
billy: i promise i won’t do it again (farts even more)
timmy: RIGHT THAT’S IT! *loads shotgun*
billy: wait man i ate a lot of spicy food i can’t control my far-
timmy: BE GONE!!! *shoots timmy in the face for being a fartass*
fartass by jkdsjksdhsdakjsdakldfja September 9, 2023

Fartass around

Waste time doing something pointless and unproductive. Usual meant as a negetive
A: What are you going to do on your holiday break?
B: I dunno, probably just fartass around all day.
----
"Teens today have no drive. They just fartass around"
Fartass around by FrozenEternity October 10, 2015

smuckin fartass

The reverse of "Fuckin Smartass"

Used in a more playful and acceptable tone that can be tested in a work, school, and religious environment without fail
"Quit being a smuckin fartass!"
smuckin fartass by D. Hunter February 25, 2005

Fatass Jonny 

"Fatass Jonny" is a term created on December of 27th, in 2020. First ever footage of such term used was documented in the video titled, "Fat ass Johnny (CSGO Moment)" uploaded by the channel, "Mrbailey channel". The term is frequently used in the CS:GO community. It is used to call someone who spent, or currently spends, money on the CS:GO game starting from when the game became free in 2018.

Clarifications;
An individual cannot be called a "Fatass Jonny" if they sold something on the Steam market and later on bought something in CS:GO.
An individual can be called a "Fatass Jonny" if they took money out of their wallet to buy something in CS:GO.
An individual cannot be called a "Fatass Jonny" if they took money out of their wallet to buy a Steam gift card and then purchase something in CS:GO.
An individual can be called a "Fatass Jonny" if they bought an item in CS:GO that was planned to make profit from, but failed to do so.
Danny spent $20 on a CS:GO skin out of his own wallet, he has now become a Fatass Jonny.

Lev is not a Fatass Jonny because he sold his skin for $20 when originally he bought it for $15, and therefore made profit.
Fatass Jonny by exxarushii February 8, 2022
More from Urban Dictionary

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
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