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
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A barrier, either physical or metaphorical, that exists between two acquaintances: one of whom is straight and the other of whom is gay.
Gay Person A: Dude, I am so excited right now, I could hug you!
Straight Person B: Dude, not so long as we have this ga-barrier between us.