DAFFY Meaning of DAFFY in English ■ adjective ( daffier , daffiest ) informal silly or mildly eccentric.Derivativesdaffiness noun OriginC19: from north. Engl. dialect daff 'simpleton' + -y 1 ; perh. related to daft . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004