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To jackcaton is when someone acts like they know everything about a game but actually have no life and just sit there screaming at a screen.
"You jackcaton! I beat you 10 times!", from a guy who plays 2 hours a week.
"Jackcaton? More like Jackcaton the loser.", said by someone who lost 5 times.
Jackcaton is the reason I have 300 friends who don’t know who I am.