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2.
1.) being stupid, or being a jerk.

2.) in a jacking off mood.
Mann last night I was in a jerkish mood, so I whacked off to a playboy.
by 123456789:) March 25, 2010
 
1.
to do something that a jerk would do
Stop acting jerkish, Paul!
by Neo Harlequin March 17, 2005