A flat, narrowly angled rear-end of a woman, usually resembling a semi-circle, or a piece of pita bread. Pita Butts usually occur in older women who primarily wear mom jeans
A: "Dude I'm so into cougars right now"
B: "Yeah but I hate when everything is all saggy"
A: "Saggy boobs don't bother me. I just can't stand when they have Pita Butt"
B: "Yeah. Pita Butt reminds me too much of my mom."