“In like Flynn”
https://en.wikipedia.org/wiki/In_like_Flynn
“Quinion also notes that the title of the film In Like Flint (1967) is a play on the term, and that has led to a malapropism where some speakers believe that is the original phrase.”
I was thinking of James Coburn, and the movie, when I said that. Don’t know why, just popped into my head.