Eating vinegar
Eating vinegar is when you’re so green with envy you could start a food fight just to make someone else feel bad. It’s like your insides are pickled and your mood is ruined.
I was eating vinegar when my friend got the last piece of cake.
He got the better grade and I was eating vinegar like it was a full-course meal.
She got the better job and I was eating vinegar while I stared at the ceiling for an hour.