To work really hard on something.
Dude, you'd better bust ass if you wanna finish that on time!
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To bust ass is to fart. BUT if used with a possesive, it means to work hard.
Also often used with a possessive and immediately followed by an infinitive
I just busted ass and it smells real bad.
You better be busting your ass if you want to finish the job on schedule.
I was busting my ass to finish my homework on time.
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when somebody lets out a disgustingly huge fart; this is usually announced.
"Whoa shit you guys! Back up! I'm about to bust ass"
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To fall real hard on ones ass.
Leslie slipped and busted her ass
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to rip an unprecdentedly large fart, one that sounds like a large plane has just flown overhead
also see busting ass
past tense: busted ass
"Hold on to your hats everyone, I have to bust ass"
"Damn, it sounds like a grizzly bear growling in here! No, it was just dad busting ass again"
"My ol' man busted ass so hard it woke me up!"
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A woman whose breast cleavage looks like someone's buttocks.
Damn, wigga! Your woman's gotta bust ass. You best keep her off the beach.
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As a noun: a fart; as a verb: to fart, or sometimes to involuntarily emit a spray of fecal matter.
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