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1.
A muggintop refers to when the fat around a female's leg, at the point of entrance to her Ugg boot, is actually wider than the top part of the boot. This creates a muffintop on top of the Ugg, hereby referred to as a muggintop. It is usually a deal breaker.
I was totally down to funny fuck that girl until I looked down and saw her muggintops.
by PhillipSpencer December 19, 2010
 
2.
when a girl with very fat legs puts on a pair of Ugg boots, creating a muffin top effect around her cankle area
"Yo, Brett, check out that girls muggin tops"

"Dude, gross, I can barely stand to look at Uggs to begin with, let alone all of that leg fat pouring out of them."
by smclife February 22, 2011