v. phr, , slang To act in a strange way; to be foolish. Now I know he has a screw loose he stole a police car this time. He was a smart man but had a screw loose and people thought him odd.
HAVE A SCREW LOOSE
Meaning of HAVE A SCREW LOOSE in English
American idioms English vocabulary. Английский словарь американских идиом. 2012