The little square gap between the top of some girls' thighs.

Most girls' thighs come together in a point before the pelvic girdle, but chicks who are particularly trim will have a small, square gap between their thighs.

That is Hogan's Gap. Can be abbreviated simply to Hogan.
Simon admired the cheerleader's Hogan's Gap through her lycra hot pants.
by Gunnar Longshanks January 3, 2007
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