secret squirrel
n.— «All of us on the base knew that, like the detainees, we were likely to be under surveillance wherever we were. Watch what you’re saying, soldiers would joke, because the “secret squirrels” are listening.» —“An American in chains” by James Yee Times (London, England) Oct. 9, 2005. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
A Dallas, Texas, woman and her friends often use the expression All the things to mean something like and whatnot or as a way to signal a kind of mutual understanding, suggesting something similar to the phrase you know. This sense probably comes...