According to Urban Dictionary a gay-o-meter is a word you can use when a straight person starts acting a little too homosexual.
Example.
Hank: OMG I love your hair!
Bill: hey Hank I think u should turn your gayometer down a couple notches.
Years ago I took the gay-o-meter test.
I scored 33%
I’m a little older now and went to the site offering the test.
http://www.okcupid.com/tests/the-gay-o-meter-test
This time I scored on the Bi/Asexual Chart
13 girl-gayness and 10 guy-gayness.
So I’m more lesbian than gay.
Oh Joy.