To be weird but in an awesome way or to be an overall awesome dude/dudette
DUDE!! Did you see that jackish concert?

See that dude over there? He's jackish!
by Teh Jackish Person December 12, 2007
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To have Nazi qualities or Something that pertains to the Nazis'
Hitlers uniform was Jackish.

Some would say that president Bush is very Jackish.
by SpaceJester November 24, 2006
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