An expression used as a response when unable to qualify or quantify a ridiculous, impossible, and/or unreasonable statement or question- and the statement maker asshat requires a response that will make him/her think about why they would have spoken in the first place.
Margaret : I will live well, traveling the world with my makeup and hair squad, but Iâll stay humble so I really understand the people.
Me: can I have some quiet, please?
Margaret: my personal chef will cook all my meals at the most local restaurants spots I can find.
Me: oh, fuck an egg.