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When you are out in the cold doing exercise ect. for so long that the tip of your penis turns white instead of pink. Therefore you now have a White Helmet.
Jimmy: Dude, fuck track practice in the morning, it's so cold I got a white helmet like 5 minuets into the jog.

Mike: Same I need some warm water.
by Sammy Cadels October 08, 2011
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