dumber than a sack of dirty underwear

Can be said about someone seriously lacking brain activity.

Me- You'll never believe what Lil Kurt did today!
Evil Tim- What did he do? Did he try to marry a donkey again?
Me- No, it's even more idiotic than that... the boy tried to launch himself into orbit by supergluing some Roman Candles to his butt! He's in the hospital now for severe rectal burns.
Evil Tim- Man, he's dumber than a sack of dirty underwear...

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