hair across your arse - If you have a hair across your arse, your butt is so mad it

If you have a hair across your arse, your butt is so mad it could start a war. It’s like your butt is giving you the finger.

I had a hair across my arse when my friend broke my favorite pencil.

My dad had a hair across his arse because his coffee was burnt.

I had a hair across my arse when my cat knocked over my cereal.