It's a SECRET code that you two
get to figure out together.
The Big Bang Theory Season 12, Episode 2
Is it a SECRET bank account?
'Cause that would be awesome.
The Big Bang Theory Season 9, Episode 20
This is the SECRET knock:
The Big Bang Theory Season 1, Episode 16
Well, I have a SECRET
I've been keeping from you, too.
The Big Bang Theory Season 9, Episode 20
Your SECRET is safe with us, my lady.
Game of Thrones Season 4, Episode 8