bfam: an acronym for cousin from another mother.bfam: a mate who you're near, however demonstrably have different moms..MA BRO!also sfam: sista from anotha mista The shortern term for Brother From Another Mother, ergo its BFAM. It simply suggests extremely good friends. A series of letters that stands forBrother From Another Mother.He is your bro, your absolute best buddy, although he's from another type of mom. The name of a team of University of Washington Men's baseball people whom make ill songs and therefore are hilarious. Look em through to YouTube!