"Glenn Beck is a massive Douchecaster." "Diane Rehm is a massive Douchecaster." "I don't care if he's funny, I still think Stephen Colbert is a Douchecaster." "Karl Rove seems to have found a new career as Douchecaster."
The act of being a douche while in public
for ex. Tom and Matt are at the bar and two girls walk up
Tom: hey sexy bitches how bout a drink for you two??
Matt: bro you only got twenty bucks left??
Tom: ( blank expressionless face) your such a doucheboater.