The term 'BUB' can refer to several different people. SONNY is a five-letter name that could be used as a nickname for someone, BUSTER is a six-letter name that could also be used as a nickname, KIDDO is a five-letter name that could be used as an affectionate term for someone, MAC is a three-letter name that could be used as a nickname, FELLA is a five-letter name that could be used as a term of endearment, and CHAP is a four-letter name that could be used as a term of address. All of these terms could be used to refer to someone in a friendly or affectionate way.