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1.
A flat ass. Also "white girl butt".

Opposite of apple bottom
That girl got a pancake bottom.
by Malcom X November 23, 2004
 
2.
a flat ass commonly seen on white girls
Why would I be attracted to Sara? White girl gotta pancake bottom, and I need a big ol' ledge booty!
by Paul Thundergod June 29, 2007