Derived from the term used for nurses in the 1950's (one who wore primarily white clothing with one bright pink stripe down the side), a term used to describe someone whose actions are downright asinine and borderline homosexual.
Metrosexual Guy - Hey, bud, want me to put some sunscreen on you?
Straight Guy - Fuck no, dude!
Straight Guy's Girlfriend - What the hell! Why do you always have to be such a candy striper?!