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Arising from the combination of arm pit and loin, the pitloin is the area of sweat which forms around the croch during periods of heavy sweeting. The pitloin is normally seen in men but can sometimes be seen in women.
"Dude, Matt was suffering from some mad pitloin after yesterday's run."

"I know man. They should seriously make some kind of deodorant for that."
by aXiz1432 April 29, 2016
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