
...and when my roommate got engaged,
my GIRLFRIEND wanted to move in with me.
The Big Bang Theory Season 8, Episode 1

That doesn't make any sense,
she knows I have a GIRLFRIEND.
The Big Bang Theory Season 10, Episode 24

I lived with my old GIRLFRIEND.
The Big Bang Theory Season 10, Episode 6

Is it cheating
if a guy has a GIRLFRIEND...
The Big Bang Theory Season 5, Episode 7

What, you invited
your GIRLFRIEND?!
The Big Bang Theory Season 5, Episode 19