MUSTANG Meaning of MUSTANG in English [ 'mʌstaŋ ]■ noun a small and lightly built feral horse of the south-western US.OriginC19: from a blend of Sp. mestengo and mostrenco , both meaning 'wild or masterless cattle'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004