bricks shy of a load
Mentally impaired, either unintelligent or merely eccentric. For example, He may be handsome but he's not too bright—a few bricks shy of a load. This term, transferring a light load to lightweight mental capacity, is usually preceded by either a few or a specific number such as two. [Slang; 1960s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.