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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
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May 14 Word of the Day
Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy
Person A: Man, that nutcase Martin Bryant guy shot 35 people in Tasmania!

Person B: No, he wasn't a nutcase, that was just a psyop so the government could have an excuse to ban guns.
by Mystikan April 11, 2006
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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
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4
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
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5
Something which makes Jack unique, generally an action which he uses or performs
Being incapable of not looking at a person's breasts is a form of "Jackism"
via giphy
by Darlo123 November 22, 2020
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6
Something that makes Jack unique, generally an action only he uses or performs.
Being incapable of not looking at any person's breasts is a form of "Jackism"
via giphy
by Darlo123 November 22, 2020
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