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The gap at the top of a girls legs. You can use the Cunt Gap Index, or CGI to measure this and it is in finger widths ranging from 0 where you couldnt fit anything in to 4 where an upturned palm could fit between the legs therefore really displaying an impressive windy gap
That girls windy gap has an impressive CGI of 4!
by Wearthefoxhat January 05, 2018
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