A douche is both arrogant and stupid, but he is neither disingenuous nor abrasive. Due to his stupidity, a douche is always unaware that he is a douche.
/do͞oSH/
Noun
1. Person who uses flattery and any other means possible to get a girl
2. An obnoxious bastard who mooches off of family and friends and is a complete and total ass to everyone.
Adjective
1. Does not describe Joon even though he likes to wear hat backwards
"That guy is wearing a hat backwards. What a douche."
Someone who dresses kind of gay but is clearly straight
A douchebag also has a "I'm better than you" attitude.
" He looks like such a douchebag "
" Stop being a fucking douchebag "
A person who is a complete idiot, devoid of any common sense or social skills and has total disregard for the fact that the entire world knows this.
Dave: That jerkoff who sells shit on TV is a complete douche.
Bob: Who, Billy Mays?
Dave: No, that douche is dead, I am talking about that other douche who sells shit on TV.
Bob: Oh, you mean that fucking douche who sells ShamWow.
Dave: Yes, that is the douche I am talking about.
To give a very typical item a thorough scrubbing.
"Yo, ma, I'm going to douche my car." or, "Hey, Sammy, I'm going out and when I get back, I expect you to have douched this kitchen."