a cunt's errand - A boring or stupid task that you have to do, even though it'

A boring or stupid task that you have to do, even though it's clearly not worth the trouble.

I had to help my grandpa with his garden. That was a cunt's errand.

I had to clean my room before the weekend. That was a cunt's errand.

I had to answer the phone for my mom all day. That was a cunt's errand.