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3.
A popped collar. This gives off a clear signal that whoever is waving said doucheflag is, in fact, a douche.

Men who fly the doucheflag are often known to wear colorful plaid shorts and sport their favorite pair of Crocs.
John: Dude, Tommy should take down that doucheflag or nobody is ever going to talk to him.

Derek: Fo' sho'. He's such a douche.
by Seph Exo August 27, 2009
 
1.
Another name for car window flags.

People think they are super cool flying flags on all their car window, but everyone else thinks they are douchebags.
Doucheflag flyer: Hey check out the sweet Super Bowl champions window flag I have on my Jetta. The Patriots are the best!!
Bystander: Not only do you look like a giant douche for just having a doucheflag, but the Patriots haven't even been to the Super Bowl in years.
by ronious January 13, 2010
 
2.
n., a popped collar, by which fellow douches signal their identity to each other
Bill raised his douche flag as he entered the room, forming alliances without speaking a word.

You can't buy Stacy a turtleneck, she flies a douche flag everywhere she goes.
by Sara Bert December 17, 2004