Dumb as a box of rocks

adj, slang

Definitions

Adjective
  1. 1
    Very stupid. slang

    "The drummer in my friend's band is pretty hot, but he's dumb as a box of rocks. I hear he likes me, and I definitely don't want to date him—but is his stupidity any reason not to simply have sex with him? — Carla, Brooklyn, New York"

Etymology

Variation of dumb as a rock.

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