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A radar detecting the homosexuality of someone or something. Gaydars are not physical devices, rather a small part of the brain used to factor characterisitcs such as voice, actions, excitement and tightness of pantwear together to get a gayreading. gaydars also do not measure any kind of speed, so don't be an idiot and see how fast you can pitch a baseball with it, or you'll lose it.
So you guys, does derek really walk the other side of the sidewalk?
Well, my gaydar on him is through the roof.

I hear Jane bats for the other team.
Hm, she does have a pretty high gaydar.

Tellitubies have the worlds highest possible gaydar.
gaydar by Sawyer June 16, 2006
Related Words

National gay day 

everyone be gay today! April 18
#nohomo
Hey be gay with me it’s National gay day, but no homo!”
National gay day by mmalyssa April 12, 2019
(n.) sometimes a sixth sense for people detecting a queer at least 10' away.
Oh shit my gayrays are all over the place!
gayrays by chicoblaco May 16, 2005
Very similar to ayaya from Kin-iro Mosaic, the only difference is that it's for gays. Also, you can call people gayaya.
Come here gayaya.
gayaya by zf a god January 19, 2021
A person's ability to tell if a person is gay/homosexual/flamer etc.
Bob - "Man, I swear that guy's gay."

Jose - "He's gay, my gaydar is really good, and your friend steve is also gay."
Gaydar by b W i t September 21, 2005
A person's ability to sense the homosexuality in another.
"Seriously. My gaydar goes off when he's near."
Gaydar by chineeeeeeeeese April 27, 2009