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1.
When someone who should not be wearing short shorts is- and their lumpy fat ass hangs out the bottom, looking nasty like a biscuit.
See peopleofwalmart.com

Eww, look at that biscuit bottom.
by coubricol May 14, 2011
 
2.
The opposite of muffin top. Someone whose butt cheeks hang belong the bottom of their shorts.
"The biscuit bottom on that chick made me lose my appetite!"
by ergirl August 28, 2011