bum chum in English dictionary bum chum Meanings and definitions of "bum chum" (idiomatic, derogatory) A male’s homosexual partner. noun (idiomatic, slang, derogatory) A male’s homosexual partner. more Grammar and declension of bum chum bum chum ( plural bum chums) bum chum (plural bum chums) more Sample sentences with "bum chum" Declension Stem Match words all exact any Try again Authors