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1.
The act of being an asshole.
Dude, that is totally assish of you to jack off in Travis's shampoo!
by Fuzzy Walrus September 26, 2006
 
2.
originated from its obvious brother word ass. To act in a way that would be considered rued, cruel, and inconciderate from a person who is normally known as anass.
Brandon for you to insulte me in front of my friends like that is a real assish move!
by greeksausage January 07, 2009