An experience when you fart and the fart gasses get trapped between your cheeks causing a bubble sensation, that will either raise up your crack or sink between your legs making you press your arse cheeks together in an attempt to "pop it"
"Oh man I have a Butt Bubble!"
"Damn man thats disgusting!!"
"OH GOD ITS JUST SITTING THERE!"
"OH MAN OH MAN OH MAN"
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