What is There's A Bat In Da Cave?
1.
It is what you tell someone near a group of people that a booger in their nose is visible without letting anyone else know.
When we were talking in line, I noticed that Louis had a big ass
booger in his nose, so I said to him as I slightly pointed at mynose , "There's a bat in da cave". Then he secretly picked his nose with a napkin.
See