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Drunken (British) brawler. Taken from the general style of getting drunk, starting fights and wearing dress shirts.
Mr. Bimbom got a bit shirty last night and started a fight with the bartender.
by Dr.Tim.California April 26, 2007
Flustered and pompus, like you would be if someone asked you a question you find incredibly offensive. Happens a lot with teachers and snobby upperclassmen.

Another British bit of fun. Used in "Angus, Thongs, and Full Frontal Snogging" and "Harry Potter and the Goblet of Fire". See snogging.
I asked Mrs. Wenger if she was PMSing, and she got all shirty with me.
by reader June 16, 2004
The act of shooting a load on your t-shirt
Oh shit i gave my self a shirty and forgot to change
by gmeisterxx June 28, 2011