Slang for anything that's a pain in the ass. A lot catchier than just saying something's "PITA" and can easily be overlooked by non-suspecting parties.
Damn bro, that test was HARD!
Ya, that teacher is pita bread, yo.
Money that was a Pain In The Ass to earn.
"Yeah, the tips were fine, but the customers were dicks, so it was all PITA Bread."