The ratio of thigh to butt on a woman; easily viewable by a visible "crease" between the thigh and butt. The thigh to butt ratio is larger based on the length of the crease.
Steve to Tim: Damn, look at that girl's thigh butt. I would just love to put my hand in that crease...or maybe just swipe my ATM card.
by damadalpha January 30, 2009
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when the butt is so flat that it connects straight into the thigh;

or when the butt and thigh are so big that you cannot tell which is the butt or the thigh
she has a butt-thigh!!
by Juju Huckabee September 19, 2006
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the absence of a butt, when one's butt merely looks as if it were part of one's thigh. Comes from the ancient Greek goddess, Rebecca.
Damn, that girl has no ass- she has a butt thigh!
by Lindsay August 29, 2004
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