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A p0oner is someone who plays online games and thinks they're the best even though they're barely holding on. They scream about how their team is a bunch of losers and won't stop talking even though they're the one who messed up.
"I'm the best! You're all noobs!", while getting killed by a 10-year-old." "Why won't you listen to me? I'm a pro!", after dying 5 times in a row." "I know what I'm doing!", while running straight into the enemy."