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you yell it when someone sticks their cat in the microwave like it's a bad joke and they’re the punchline.
My neighbor microwaved his cat for 2 minutes. I said 'O Son Dubliegbook!' and he cried.
She put her cat in the microwave and said 'It's for the greater good.' I said 'O Son Dubliegbook!' and her cat exploded.
He put his cat in the microwave and forgot about it. I said 'O Son Dubliegbook!' and it smelled like burnt hair for a week.