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

I'll put that money into a CD,
wait for that CD to MATURE,
The Big Bang Theory Season 11, Episode 9

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

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