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AC/DC

or A.C./D.C., ac/dc, a-c/d-c, a.c.-d.c.

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Electricity.
  1. alternating current or direct current.
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AC/DC

[ey-see-dee-see]
adjective Slang.
  1. sexually responsive to both men and women; bisexual.
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Origin of AC/DC

1940–45, for an earlier sense; 1960–65 for this use
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ac-dc

AC/DC

adjective
  1. informal (of a person) bisexual
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Word Origin

C20: humorous reference to electrical apparatus that is adaptable for alternating current and direct current
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ac-dc

AC/DC

adj.

electronics abbreviation of alternating current/direct current, by 1898. As slang for "bisexual," 1959, said to have been in use orally from c.1940; the notion is of working both ways.

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Online Etymology Dictionary, © 2010 Douglas Harper