one brick short of a full load
Definition from Wiktionary, the free dictionary
- (idiomatic) Not mentally sound; insane.
- I feel fine today, but that gentleman conversing with the house plant there may be one brick short of a full load.
- (idiomatic) Stupid.
- You have to be one brick short of a full load to think that '7' is a letter in the alphabet.
not mentally sound; insane