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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
 
3.
Is when a person is rude but at the same time nice because of the inflection in their voice.most of the time used aginst one of the mean girls.
Yo that cheeraleader is so jerkish!
by orcas and giggles October 08, 2014