pain in the arse
Something that bugs you like a fly on your butt, but not bad enough to make you scream or throw things. It’s more of a daily annoyance than a full-blown disaster.
My math teacher is a pain in the arse because he yells at me every time I mess up.
This traffic jam is a pain in the arse, and I’ve been stuck for 45 minutes.
My little brother is a pain in the arse because he won’t stop bugging me.