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An i-dub-nub is a noob who cheats using the IW80, a weapon so strong it feels like it’s giving you headshots for free. It’s basically a headshot machine, and it makes everyone else look like they’re shooting blind.
"You’re an i-dub-nub! I’ve seen my grandma shoot better than you!", @SocomNoob420
"I’m not cheating, I’m just being a i-dub-nub. What’s the difference?", @CheaterKing123
"He’s an i-dub-nub, and he’s got the headshot count to prove it.", @HeadshotHater88