thick as two short planks
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(as) thick as two short planks
Remarkably stupid, dimwitted, or obtuse. I smoked a lot of marijuana when I was in high school, so I turned out thick as two short planks by the time I finally graduated. Jen's new girlfriend is very nice, but she's as thick as two short planks.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
(as) thick as two short ˈplanks(informal) (also (as) thick as ˈshit taboo, slang) (British English) (of a person) very stupid: Because she’s a model, people assume she’s as thick as two short planks, but she isn’t. OPPOSITE: (as) bright as a button
Thick is the opposite of thin and can also mean ‘stupid’ in informal language.
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