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
The adjective corny describes someone or something “unsophisticated” or “naive.” This sense of corny goes back at least as far as the 1920s. Seed catalogs of the time often contained bits of goofy jokes and broad humor...