pain in the butt

(idiom) something or someone that is very annoying or troublesome

Example Sentences:

This new class is a pain in the butt. It’s so difficult….and boring!

My little sister is a pain in the butt! She never leaves me alone!

Similar idioms:

1. pain in the ass
2. pain in the neck
3. bug
4. no pain, no gain
5. butt-naked
6. get to