Top Definition
A movie in tropic thunder, in which ben stiller goes full retard hence simple jack.
Save Simple Jack. Save the retards

"Once upon a time ... there was a retard."

"You went full retard, man" Robert Downey Jr.
by P&W August 19, 2008

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A simpleton, fool, full retard, or idiot. Origin: "Tropic Thunder" movie by Ben Stiller.
"Don't mind that boy and his foolish mistakes. He can't help it; he's just a Simple Jack."
by Dan82087 August 15, 2008

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1:

To not pull off a retarded impersonation.

2:

To look retarded trying to 'look retarded'
Dude 1: Hey, did you see that guy's retarded impersonation? I totally was not impressed.....

Dude 2: Yeah.. he was going full retard..

Dude 1: ......Simple Jack status...
by D_4_Less August 18, 2009

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Used as an adverb for stupidity. Taken from tropic thunders "full retard" scene
That girl was just dumb, she was simple Jack dumb.
by I don't care any more April 10, 2017

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