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Dumber Than Dirt

A variation of "dumb as dirt" used in the graphic adventure video game Full Throttle developed by LucasArts.

Extremely stupid.

Likely conceived for its alliteration.
Ripburger, you're dumber than dirt!
by Carl Sackrider February 23, 2019
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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...
by Shawn B. January 15, 2007
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