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1.
In the game of guy attracts girl, the only winning strategy for men any more is to simply be a complete tool, or douchebag. The sweet guy will always end up turning into the gay bestfriend with no hope of recovery.
Joe: You hear that Michelle started dating Chad?
Nerd: WTF I POORED MY HEART OUT TO HER JUST LAST NIGHT!
Joe: Well you know how douchebag theory is...
by Cosban June 28, 2011
 
2.
The hottness of a guys girlfriend is directly proportional to how much of a douchebag the guy is.
Ben: Why don't you ever see a cool dude with a hott girlfriend?
Joel: Ever heard of the douchebag theory? Check it out on Urbandictionary.com!
by samerK July 30, 2009