eating one's vegetables
Getting forced to do something super gross because you were a terrible kid. This can mean butt sex, swallowing cum, having your hands shoved up your arse, or getting peed on by someone with a golden helmet.
He had to eat his vegetables after he told his teacher to go f*** herself.
She got forced to eat her vegetables because she insulted her teacher in front of everyone.
He had to eat his vegetables because he told his mom to go f*** herself in front of the whole family.