Top Definition
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.
by TheNewYorker June 02, 2014

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