WEIRDO Meaning of WEIRDO in English I. ˈwir-(ˌ)dō noun( plural weird·os )Date: circa 1955: a person who is extraordinarily strange or eccentric II. adjectiveDate: 1962: strange , weird Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003