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Gas Ass is a terrible condition in which a person is constantly letting out extremely stinky farts. Another name for this is "Chronic Flatulence" but "Gas Ass" is easier to remember and it's more modern. After a period of time of having Gas Ass, the butt will smell like stinky poop for the next 24 hours. Gas Ass is so bad that the farts stink up the entire room and it smells so bad that everyone else in the room has to leave while moaning, coughing, wheezing, etc. and putting their noses in their shirts and their eyes close. Usually they will be cursing, screaming, etc. When one has Gas Ass, you can literally see a cloud of brown hover around their butt. Gas Ass is a condition that no one should have and should be treated as soon as it's discovered.
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Situation 1:

Calvin was sitting in class one day when he started to absolutely rip ass and loud and horrible-smelling as humanly possible.

Michael: Dude, Calvin has the worst case of Gas Ass ever!
Dude: I know!

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Situation 2:

Calvin has Gas Ass later that night and is absolutely ripping ass at the dinner table.

The Dad: Calvin, that smells f*cking terrible, what is your sh*t?

Sister: OHMYGODITSMELLSSOBAD!!!!!!!!!!!

The mom then passes out while the sister and the dad evacuate the room while Calvin has a big smile on his face.
Gas Ass by TheGasAssMaster December 4, 2012
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ass or gas 

When one is giving another a ride they say "ass or gas". Ass being some type if sexual satisfaction and gas being gas money or gas. Most acceptable type of payment is ass.
It's either ass or gas Becky.

Dude, Becky paid with ass!
ass or gas by JakesBigDick September 24, 2013
The act of inserting a gas pump into your anal cavity and proceeding to pump gas.
I wouldn't pledge Chad's frat, I heard he likes getting gas ass
Gas Ass by Graet August 4, 2018

Ass for Gas 

The act of using sex, either intercourse or fellatio, as a form of payment for getting a ride from someone
Hey Bryan, Tina is wanting a ride home from work, u think i should take her?
As long as she has the Ass for Gas why not, she is kinda cute.
Ass for Gas by Partsguru13 March 2, 2018

Gas or Ass 

Said to hitchhikers: literally meaning pay for gasoline or give a sexual favour.
Baby, gas or ass. Pick one, or get out.
Gas or Ass by BAcINBLACK February 7, 2019

gas or ass 

Motorcycle riders know that if you go too slow in a tight turn you will fall off your bike.
If you even think about a U Turn in this parking lot it is going to be gas or ass.
gas or ass by Bobcat Tommy September 14, 2012

GFA. Gas for Ass 

A girl you’ve met on internet pretends to want to meet you for sex and games. But she need gas for her car which she much receive to be able to make the trip to see you. Send her the money on cash app or Venmo and you never see or hear from her again.
GFA. Gas for Ass She was Gas for Ass..I thought she was “the one” could have been the love of my life but she just turned out to be another GFA Gas for Ass Scammer. Probably a dude in his parents basement who stole photos of a pretty girl
GFA. Gas for Ass by RJ Miller January 14, 2024