Top Definition
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 August 09, 2008
6 Words related to barrier gas

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