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.
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.