three bricks shy of a load

three bricks shy of a (full) load

A derogatory phrase meaning not very intelligent or of questionable mental capacity. Don't listen to that nut job—he's three bricks shy of a load. The new manager is nice enough, but he's three bricks shy of a full load, if you ask me.
See also: brick, load, of, shy, three
Farlex Dictionary of Idioms.

three bricks shy of a load

stupid; dense; shortchanged on intelligence. I would never say she was dense. Just three bricks shy of a load. Why do you act like you're three bricks shy of a load?
See also: brick, load, of, shy, three
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

three bricks shy of a load

mod. stupid; dense; shortchanged on intelligence. I would never say she was dense. Just three bricks shy of a load.
See also: brick, load, of, shy, three
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • a few cards short of a (full) deck
  • a few cards shy of a (full) deck
  • a few eggs short of a dozen
  • bananas
  • a few bananas short of a bunch
  • foundry
  • nut factory
  • nut-foundry
  • nuthatch
  • nuthouse