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Factlulu is when you think you're right but you're just being a smug idiot who won't shut up about it
I swear the sky is green. Everyone else is wrong. I'm not delusional. I'm factlulu.
He said the pizza was bad. I said it was legendary. Now he's factlulu and I'm just being cool.
She claims she can fly. I said she's factlulu. She said I'm delulu. We're both wrong.