bidar

bi +‎ -dar, after the pattern of gaydar.

bidar (plural bidars)

1. (slang) The ability to detect whether or not a person is bisexual by observing that person.
   • 1999 October 22, Kay Dekker, “Re: crush server redux”, in soc.bi, Usenet‎:

     Though I _think_ he's straight: but then my bidar isn't always running at 100%.

   • 2006, Nicole Krista & Mike Szymanski, The Bisexual's Guide to the Universe: Quips, Tips, and Lists for Those Who Go Both Ways, Alyson Books (2006), →ISBN, page 131:

     Bi people hang in straight places a lot, and given that you are also bi, they will probably stand out to you in an indescribable, nonverbal way. And that, my friend, is bidar.

   • 2013, Shiri Eisner, Bi: Notes for a Bisexual Revolution, Seal Press (2013), →ISBN, unnumbered page:

     Of course, not all bisexuals are recognizable, and many will easily defy the bidar, whereas others will appear to be bisexuals without actually identifying as bi.

   • For more examples of usage of this term, see Citations:bidar.

• queerdar

• Baird, braid, rabid

From Middle High German wider, from Old High German widar (“against”).

bidar

1. (Sette Comuni) against

   bor un bidar ― for and against

• “bidar” in Martalar, Umberto Martello; Bellotto, Alfonso (1974) Dizionario della lingua Cimbra dei Sette Communi vicentini, 1st edition, Roana, Italy: Instituto di Cultura Cimbra A. Dal Pozzo