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1.
A phrase said by a douche bag to a weak soul after committing an act of douchebaggery to them. This is said in an attempt to point the blame to the victim rather than yourself.
Steven: Patrick...don't you think you've had enough to drink tonight?
Patrick: Don't be a douche bag!

Patrick: I'm hungry (Takes lunch money)
Steven: HEY! thats mine! My mommy gave me that!
Patrick: Don't be a douchebag!
by Pat Manson February 24, 2010