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.
Mike: Same I need some warm water.
by Sammy Cadels October 9, 2011