KEG Meaning of KEG in English ■ noun1》 a small barrel, especially one of less than 10 gallons or (in the US) 30 gallons. 2》 Brit. short for ~ beer .OriginC17: var. of Scots and US dialect cag , from ON kaggi . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004