slang Bisexual. "AC/DC" is a term typically applied to devices that can operate on two different types of electric currents: an alternating current (AC) or a direct current (DC). A: "Dude, are you sure that girl you hooked up with is AC/DC?" B: "Yes! I just saw her kissing some chick at the bar."
mod. bisexual. (Older. Initialism.) I didn’t realize at first that we were in an AC-DC bar! He was reported to be “AC/DC” by a member of the press.