
Well, it's very CASUAL. No dress code or...
The Big Bang Theory Season 2, Episode 10

I've extended a friendly,
CASUAL greeting.
The Big Bang Theory Season 3, Episode 10

No, I'm all done with CASUAL sex.
The Big Bang Theory Season 2, Episode 2

There's a difference
between CASUAL and weird.
The Big Bang Theory Season 11, Episode 8

What, you don't even get
CASUAL Saturday?
Breaking Bad Season 2, Episode 8