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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.
Bisexual, that is, sexually attracted to and/or active with both men and women. Originally an abbreviation for alternating current/direct current, the term has been used jokingly since the mid-1900s. Also the name of the Australian rock band, formed in 1973, that is one of the highest grossing bands of all time.