To become excessively annoying, boistrous, or unbecoming of a normal human being, esp. in the presence of a peer group.
Bob: Man, look at Jim over there!
Mark: I know, he's totally douching it up!
Bob: Let us proceed to beat him an inch from life for such unacceptable behavior.
Mark: Indeed.
by Chenzo23 September 14, 2006
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A person is already a douchebag. But when he or she gets drunk. It a whole new level of douchery.
damn dude i never thought this guy will douche it up in the club!
by ndizzle855 February 19, 2011
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When someone is commiting an act of douchebaggery and the people around him/her make a "d" shape with their hands and say "D um' up!... DOUCHE!"

Often followed by the douchebag's own form of retaliation (example: "That's what she said", "Screw you", ect.)

Sometimes the "...DOUCHE" ending can be subtracted, leaving the douchebag confused and angry.
Douche um' up.

Douchebag- Jeez. You guys are so boring. blah blah blah.
Anti-douchebags- D um' up! DOUCHE!
Douchebag- Wow, you guys are faggots. blah blah blah.
Anti-douchebags- *walk away in a pack*
Douchebad- You guys are such nerds! blah blah blah.
by Mitchel L October 25, 2007
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