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A Jackneck is someone who talks trash and gets a face full of fist when they don't shut up.
You: "I'm gonna win this game." Jackneck: "You're gonna lose like a chump." Me: "Face full of fist."
Jackneck: "You're the worst." Me: "You're the one who got beat by a kid."
Jackneck: "I'm better than you." Me: "You're not even close."