A phrase used to disregard what someone says; Used when you have no earthly idea of how to respond; a come back.
Man: "I know I made a mistake calling you a fat oaf, but you should really forgive me. I'm your Dad!"
Girl: "Well you know what, Dad. Eat my butt."
Girl: "Well you know what, Dad. Eat my butt."
by Hayyy February 5, 2008