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

I'm striking up a CASUAL conversation
with you.
The Big Bang Theory Season 2, Episode 9

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

...and engage in CASUAL physical contact...
The Big Bang Theory Season 6, Episode 1