O.N.Y.D oh no you didn't
You say it when someone does something so wild it makes you want to hide under your bed.
Your sister says she painted the living room pink. You: 'O. N. Y. D oh no you didn’t!'
Your brother says he dressed up as a chicken for the school play. You: 'O. N. Y. D oh no you didn’t!'
Your friend says they tried to eat an entire pizza in one bite and failed. You: 'O. N. Y. D oh no you didn’t!'