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To be attacked for a joke that you made many years ago, despite proof that you have changed. Named after what happened to James Gunn on Twitter.
Person A: Person B posted this offensive meme five years ago. That means he's literally Hitler!
Person C: Fuck you you racist evil pedophile psycho rapist go hang yourself!
Person D: Looks like Person B got Gunn'd Down.
by Farquiplier August 02, 2018
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