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A vagina. Usually used when referring to the vagina of a young sexy woman. A bixie should be tight, pleasant to look at and have minimal smell.
John Angus:
"Hey, check out that dirty looking whore over there!"

Hector D:
"Yeah, I bet she don't got no bixie between her legs, just a big ole nasty snatch!"
by danmk November 05, 2006