That 'personal' moisture that seemingly comes from nowhere, and accumulates in or on your groin/genital/perineal/anal areas. Can be from: sitting too long; wearing too many layers of clothing; not washing often enough; warm temperatures; or even, as with women, they see something hot, and get a little dewy down there; or with men, if you don't shake 'it' well enough.
After four days of not showering, Jimmy had a mild accumulation of groinial dew.
Sally was watching George Clooney on TV and noticed she had a little groinial dew.
by Chris and Linda Ostrom March 03, 2005

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