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.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
AC/DC
"bisexual," 1959, said to have been in use orally from c.1940, from electronics abbreviation of alternating current/direct current.
[ey-see-dee-see] 
