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A madcret is a full-blown idiot who takes dumbness to a whole new level. They’re like a cretin on steroids and also a bad decision.
My cousin thinks he’s a genius because he can spell 'cerebral' backwards. He’s a madcret.
My boss tried to explain the internet to me. He’s a madcret.
My dog thinks the mailman is his best friend. I’m a madcret.