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1.
The diamond shaped space between the thighs on a female body, just below the crotch. The twanson diamond is most commonly seen between the legs of a slimmy or a thick woman that wears very... very tight pants.

1: "Man, she got that gap!"

2: "Yeah, that is definately the Twanson Diamond."
by Z1r0 December 06, 2006
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