eating one's vegetables
Being made to do something gross as a punishment for being a bad kid. It can mean butt sex, swallowing cum, having your hands shoved up your arse, or getting peed on by someone in a golden helmet.
He got made to eat his vegetables after he told the principal he was a f***ing idiot.
She had to eat her vegetables because she insulted her teacher in front of the whole class.
He had to eat his vegetables because he told his mom to go f*** herself.