Any ideas on when it was first used like it is now?
[title of show] was the first thing that came to mind
I think it's actually been co-opted from the outside Broadway world. I've heard kids at school use it for a while now (and even back closer to 2000 with youth groups).
Gays have been using it for decades so it just may have originated ON Broadway.
There's a great chance it did.
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