A: I heard the other team is working on a very interesting project. Do you know anything about it?

B: I’m afraid I had bigger fish to fry, so I didn’t investigate it in great detail.

Note: Originated in the work “Memoirs” by John Evelyn in 1660, the idiom means to have other, more important things to do; to not be interested in something because there are more significant things to accomplish instead.

It can be used to show anger, humor, or even frustration.