
Well, he's definitely not GAY.
The Big Bang Theory Season 3, Episode 7

I said I'm her friend, not her GAY friend.
The Big Bang Theory Season 1, Episode 17

Maybe I am her GAY friend.
The Big Bang Theory Season 1, Episode 17

...l'll have to rent my womb out
to a GAY couple.
The Big Bang Theory Season 4, Episode 22

And, now, I'm GAY.
The Big Bang Theory Season 7, Episode 11