GOO Meaning of GOO in English ■ noun informal1》 a sticky or slimy substance. 2》 sickly sentiment.Originearly 20th cent.: perh. from bur~ , a naut. sl. term for porridge, based on Pers. bulġūr 'bruised grain'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004