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gay radar, the ability to recognize that a person is gay
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
The supposed ability to discern whether a person is gay or lesbian.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
informal the supposed ability of a homosexual person to recognize whether another person is homosexual
[C20 from gay + (ra)dar]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Slang. the ability of a homosexual to recognize that another person is homosexual.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
gaydar[ˈgeɪdɑːr] n → sixième sens m (pour repérer les homosexuels)
Collins English/French Electronic Resource. © HarperCollins Publishers 2005