TV series example of the word

The Big Bang Theory Season 4, Episode 18
I actually felt kind of silly just saying "on the down low."

The Big Bang Theory Season 5, Episode 5
into a low earth orbit.

The Big Bang Theory Season 6, Episode 5
Oh, low techie-techie.

The Big Bang Theory Season 7, Episode 11
Well, I have an extremely low center of gravity.

Breaking Bad Season 2, Episode 11
He's very low profile. He's careful like that.