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1.
If a person is douche bombing, it means they are being unnecessarily douchey. It is when a person is being a douche bag in a situation that does not require it.
There are also variants of the term:

A douche bomber is a person who is well known for douche bombing frequently.

A douche bomb is one statement of unnecessary doucheyness, not to be followed up with another, and sometimes followed with an appology.
Douche bombing:

Guy One: "I dunno, I kind of liked World of Warcraft"
Guy Two: "Faggot"
Guy Three: "Was that really needed?"
Guy Two: "Fuck you, dick"
Guy One: "Whatever, he's just douche bombing"

Douche Bomber:
Guy One: "I dunno, I kind of liked World of Warcraft"
Guy Two: "Faggot"
Guy One: "What?"
Guy Three: "Don't take him seriously, he's a douche bomber".

Douche Bomb:
Guy One: "I dunno, I kind of like World of Warcraft"
Guy Two: "Faggot"
Guy One: "What?"
Guy Two: "I'm sorry for that Douche bomb, that wasn't necessary".
by Staska June 14, 2009