The Chicken or the Egg?

An expression which strictly speaking doesn't have the word chicken but it does have the word egg where the chicken comes from right? Well we have to decide that in a second because we're going to talk about what comes first, the chicken or the egg. Oh right okay but for the minute let's just deal with the egg yeah that's the round thing where lots of animals are born not humans but birds yes we got an expression to have egg on your face. So imagine you're literally eating an egg and you're not paying attention and you get egg on yourface doesn't look very good doesn't. People will notice it it doesn't. Used as an idiom metaphorically if you