
That's very MATURE of you.
The Big Bang Theory Season 9, Episode 13

That would be
the MATURE thing to do.
The Big Bang Theory Season 11, Episode 15

and that stands for
"MATURE audiences," buster.
The Big Bang Theory Season 9, Episode 21

Very MATURE.
You're lucky I'm out of Silly String.
The Big Bang Theory Season 6, Episode 22

Yes, and I think it's pretty
MATURE of me to admit it.
The Big Bang Theory Season 11, Episode 11