When one is in the transaction of changing classes and lets out their fart to where they can't be heard or smelt because of the movement and noise around them. Is a play on of the words "Hall pass".
Dude I was so bloated last class that I thought I was gonna blow, but luckily I made it to the bell and let out my hall gas.
by Benny Boy Incred May 15, 2011
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Get the burning gas mug.by yeah ok.like id say my name May 17, 2006
Get the gas up mug.A bad ass nerve gas that will really fuck up your day in a matter of miniutes if you ever come in contact with it
by The Col. December 19, 2004
Get the serin gas mug.Frank gets good gas mileage because he takes little dips. Kevin has very bad gas mileage because he throws in the biggest womps in the bnc.
by kev69wells May 12, 2011
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Get the ga tsan mug.the fart before you have a poo, a layer of gas between your anus hole and poo tip, normally highly toxic, sometimes wet
sit down on toilet to take a poo you fart first then poo thats barrier gas, or you fart then you need to rush to the toilet to poo the worst type of barrier gas especially if a toilet is not close
by stoney74 October 5, 2008
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