When the vagina over heats and breaks into a sweat like no other, and forms into a stain similar to one you would find on a pedofiles wife beater/tanktop.
see pit stains
The obese woman ran across the finish line with pride, as the fans crowded around her congradulating her on the win. All that she could think about was heading to the nearest washroom to slather deoderant all over the sweaty chaos in her track pants ... HER SWAGINA.
WARNING: do not actually put deoderant on your vag.