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you say this when some brain-dead idiot talks your ear off about something you already knew, like they think you're a dumbass who needs everything spelled out in glitter and loud noises
Man, I knew that already, I don’t need you to explain it like I’m five!
Bro, I already knew that, why are you still talking?
I got it the first time, I don’t need you to repeat it like I’m a broken record.