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.
The ass of a woman or simply a woman who has had anal intercourse without enough preparation/lubrication and is now feeling some sort of pain in the ass (i.e. pita) as a result.
1. My girl R gave me anal with little to no preparation and now she's turned into a pita bread.
2. Come on boo, I told you to never EVER forget the lube but you didn't listen, enjoy your pita bread.