What does BDSB BDSB mean? March 25, 2017 All Dictionary BDSB BDSB meaning in Urban Dictionary "huge, dirty, slut bag." Refers to an unappealing feminine, frequently of a sizable framework and constantly promiscuous. Acronym for "Big Dirty Slut Bag". Always describe an unappealing female, usually of a sizable framework and fairly permiscuous.