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.
by TheGasAssMaster November 28, 2012
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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
by Graet August 4, 2018
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What some people consider the rules of hitchhiking, where the hitchhiker, upon pickup or throughout the trip, must either provide: 1)Gas for the car, 2)Some type of sexual satisfaction, or 3)Some type of drug, usually marijuana.
Hitchhiker: Yo dude, can i get a ride?
Dude: Gas, ass, or grass.
Hitchhiker: *pulls out baggie* Grass.
by punkbass_20x6 January 15, 2006
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When someone asks you to drive them somewhere, they can pay with gas, ass, or grass. Gas(money for gas), ass(a sexual favor), grass(marjuana).
Ling Ling: "I just drove you all the way to Africa. You know the rules... gas, grass, or ass."(gas, ass, or grass)
by mikec00l October 23, 2007
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Said to hitchhikers: literally meaning pay for gasoline or give a sexual favour.
Baby, gas or ass. Pick one, or get out.
by BAcINBLACK February 7, 2019
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The saying states that if a man is providing a ride or transportation for a girl. She must have common courtesy to supply the man with one of 3 things in return. 1. Grass (Marijuana) 2.Gas (Fuel for his vehicle 3. Ass (Intercourse). If she doesn't give him 1 or more of these 3 things then she would not be able to get a ride. Hence the term nobody rides for free. This became a slang in the mid 1970's when hitchikers would hitch rides down interstate routes. This term applys to homosexual males who want the same 3 options given to a man passanger. Typically a girl would pay with ass due to the fact she doesn't have funds hence why she is hitch hiking for a ride. So her ass is the only asset she can use to get transportation from point A to point B. This still happens today. In fact more then ever. So if you see a girl hitch hiking be sure to apply the gas, ass or grass tactic in your adventures. You may score gas for your ride, some grass to smoke. or usually the most appreciated of the 3. the good old sacred anal sex. So enjoy and proceed on.
Ashley- Hey wait!!

John- Hey whats wrong?
Ashley- I am stranded here in the interstate. I have to walk 105 miles till I get home. my car broke.

John- oh, im so sorry. Do you want a ride?

Ashley- Oh my gosh yes. please. your a life saver

John- But of course Gas, Ass or Grass. Nobody rides for free.

Ashley- Oh I don't have Money on me and I don't smoke.

John- well i don't know then. i guess i cant help

Ashley- No wait, ill give you the ass. i don't want to walk please.

John- Get in

Ashley proceeds to fuck john in the back of his chevy Tahoe until he cums in her mouth and then this will pay for fare of the ride he is providing her. Pretty curel tactic but it is applied often. especially in low population exposed areas without a lot of foot traffic.
by GM123 November 15, 2014
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