jackcaton
A jackcatona is a person who talks too much about a game they don’t even know how to win and still manages to lose every time.
"Why you jackcatona? You didn’t even finish the level!", from a guy who got killed by a robot."
"Jackcatona is when you talk like you’re the best, but you’re just sad."
"She’s a jackcatona and still can’t beat me at Mario Kart."