eating one's vegetables
Getting made to do something really ugly because you were a total f***ing brat. It can be butt sex, eating cum, having your hands shoved up your arse, or getting peed on by a man in a golden helmet.
He got forced to eat his vegetables because he called his teacher a f***ing moron.
She had to eat her vegetables because she told the principal to go f*** himself.
He had to eat his vegetables because he insulted his mom in front of the whole class.