1. An object used for vaginal hygiene.
2. A person, usually male, with a variety of negative qualities. Specifically arrogance and engaging in obnoxious and irritating actions.
3. One who doesn't think before he speaks or acts.
4. One with an intolerable personality.
5. One who knows nothing about the subject in which they're talking.
6. One who believes so much in his own misguided convictions that he is oblivious to the fact that they are totally wrong.
7. One who feels the need to push his beliefs or opinions onto other people.
"Who invited this douche bag?"
"I can't believe he said that! What a douche bag"
"Have you met the new guy in accounts? He is a real douche bag!"