Hair Across Your Ass
A hair across your ass is when you're so easily annoyed you'd yell at a ghost if it gave you the side eye.
I had a hair across my ass when my friend told me he was going to eat my sandwich. I yelled at him like he stole my last sock.
She got a hair across her ass because her phone battery died. She threw her phone across the room like it was a personal insult.
He had a hair across his ass because his plants died. He blamed the plants for his bad mood.