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1.
A Jackism is a word or turn of phrase used by Colonel Jack O'Neill int the television series 'Stargate: SG-1'. Common Jackisms are listed below, but there are others.
Jackisms:

'Ya think?'

'Good morning campers.'

'For crying out loud...'
by Silentiea October 10, 2006
 
2.
Hilarious, and sometimes nonsensical phrases uttered by the fictional character Jack Sparrow, from the Pirates of The Caribbean movies.
Jackisms:
1. "The only rules that really matter are these: what a man can do and what a man can't do."

2. "She's safe, just like I promised. She's all set to marry Norrington, just like she promised. And you get to die for her, just like you promised. So we're all men of our word really... except for, of course, Elizabeth, who is in fact, a woman."

3. "I think we've all arrived at a very special place. Spiritually, ecumenically, grammatically."

4. "Me? I'm dishonest, and a dishonest man you can always trust to be dishonest. Honestly. It's the honest ones you want to watch out for, because you can never predict when they're going to do something incredibly stupid."
by Paradox* August 27, 2006
 
3.
A religious cult, centered on the worship (and/or drinking) of Jack Daniels, both the drink as well as the man. (assumed deceased.)
Man 1: Dude, thats your 3rd bottle of jack today!

Man 2: What do you expect from a believer in Jackism?
by FroogleApollo April 02, 2009