What Makes Up the Name: gay + radar

I'm done defending jorts, I've said my piece, but sometimes they do set of peoples' gaydar. A good example of this came up last night when I was watching a baseball game at a bar with a friend who has no gaydar. It seems that on Mondays at the establishment in question, the clientele changes a little and skews heavily male with exposed upperbody. No big deal, but I thought I'd wait and see how long it took for him to notice and it took until they put Burlesque, starring Cher and Christina Aguilera on the projector. Then his gaydar finally went off.

Origin: First appeared in the NYT in 1993 in the education section, but most Merriam-Webster says first usage was in 1982.