Erupting gas exiting the anus violently. It can scratch the anus upon its departure if you decide to trust it.
My chainsaw fart scratched my anus.
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Series of rapid farts within a short amount of time, thus fore releasing a violent butt scratch. The sound affect is that of a chainsaw, and if hard enough can feel as if a chainsaw is on ur butthole.
โMan, my ass is really itchy, I could really use a nice chainsaw fart right now.โ
โThey are so satisfying manโ
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A chainsaw fart is when your ass itches so bad you canโt get to the itch with your fingers so you have those chainsaw farts and the itch goes away in a jiffy.
โOh man, my ass was itching so bad and when I had one of them chainsaw farts, it knocked the itch right out my ass!โ