bust my ass
To work exceedingly hard on or for something that probably wasn't worth the fucks given.
Seriously Joe? I bust my ass on this stupid chocolate mousse, and then you tell me you're allergic to cocoa? Go suck a dick Joe, suck a fucking dick.
busted my ass
the act of; pertaining to; suddenly falling
"clarence, what'd you do last night bra?"
"nothin' forrizle, drank a couple bruskies, hit on your mom, busted my ass.."
"ive busted me ass!"