Jack Mode 

To go into a stealing frenzy. From the word jack (as in to steal). Literally "stealing mode". Often yelled as one steals something in a very obvious manner.

See jack

"Jack Mode!" *runs off with object*

Jack Mode by n00bdragon December 7, 2004

jack mode 

When you're so angery that you could be considered a possible homocide offender.
Comes from the saying: Jack's got the key to the gun case. Wanna see?

I was in Jack mode when Daniel's project got a higher grade than mine.

jack mode by darth_eowyn September 27, 2006

Jackmoded 

To snatch; steal from someone. Usually something that isn't very important, and is usually usd in terms between friends just for fun.

"I jackmoded an airhead from Jeremy out of his lunchbox."

Jackmoded by Athie October 17, 2008