Man Up Your Metrosexual Roommate

Point out that "Queer Eye" is finished

Queer Eye for the Straight Guy officially ended in October of 2007 -- metrosexuality in general would do well to follow suit. As Queer Eye was the very show which propelled metrosexuality to its astronomical popularity, with the show's end, the style itself will sooner or later fall by the wayside. After all, people didn't dress like Crockett and/or Tubbs after Miami Vice ended, did they?

Let him talk to an actual woman

This may come as a surprise to him, but most chicks don't really dig the whole metrosexual thing. Oh, they love having metrosexual male friends, of course -- they love it in the same way they love having gay male friends, except this time they get all the effeminate friendship benefits and they get to torture the guy with round-the-clock cockteasing -- but they don't date metrosexuals. Women are still attracted to egotistical, alpha male assholes, and, like it or not, most metrosexuals don't fit that particular bill. Once he realizes this, he might begin to consider a lifestyle change.

Show him any movie Clive Owen has ever been in

Toss in Shoot 'Em Up, Sin City, or Children Of Men, grab your roommate by the scruff of his neck, and growl: "That is what women want. That is a man. You are not."

Tear down his metrosexual icons

According to Wikipedia, Brad Pitt and Ryan Seacrest represent the epitome of modern metrosexuality -- they're buff and attractive, but they take a great deal of care in their physical appearance and they act mildly feminine. When your buddy dresses in pink shirts and gels his hair into a gag-inducing fauxhawk, these are the men he's trying to emulate. Let him know that not only are these guys waited on by dozens upon dozens of hairdressers and makeup people whenever they appear in public -- they don't care about how they look so much as their makeup team does -- but, if Pitt's humanitarian work and Seacrest's more-funny-than-it-should-have-been rant from Knocked Up are any indication, these guys are interesting on their own merits. They wear trendy clothes in addition to being fun to be around, rather than trying to substitute the latter for the former.

Hide, replace, and/or destroy his physical care products

If your gentlemanly attempts to convince him to change his ways fail, it's time for all out war. Replace his hair gel with shaving cream, his acne cream with Cool Whip, and his cologne with your own urine. If you can't get the bastard to change of his own free will, then, by God, you're gonna have to make him change.