be (as) thick as a shit

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be (as) thick as a shit

vulgar slang To be remarkably stupid, dimwitted, or obtuse. Primarily heard in UK. I smoked a lot of marijuana when I was in high school, so I was as thick as a shit by the time I finally graduated. Jen's new girlfriend is very nice, but she's thick as a shit.
See also: shit, thick
Farlex Dictionary of Idioms.
See also:
  • be (as) thick as a brick
  • be (as) thick as a short plank
  • (as) thick as a brick
  • (as) thick as two short planks
  • thick as two short planks
  • (as) thick as two planks
  • thick as two planks