Reference to a persons behind/bottom/ass, that it is so gorgeous/sexy/hot that you just want to bury your face in it.
-Hey! Look at that ass. That's some proper pie.
-Check out that guy. He's got some proper pie.
-Dude, did you see that girl?
-Yeah! Proper pie.
-Check out that guy. He's got some proper pie.
-Dude, did you see that girl?
-Yeah! Proper pie.
by TheNewYorker June 2, 2014