one sandwich short of a picnic

one sandwich short of a picnic

Inf. not very smart; lacking intelligence. (Jocular.) Poor Bob just isn't too bright. He's one sandwich short of a picnic. She's not stupid. Just one sandwich short of a picnic.
See also: of, one, picnic, sandwich, short
References in periodicals archive ?
Ordering psychiatric reports, he said: ``This poor defendant is more than one sandwich short of a picnic.