to have egg on your face

You “have egg on your face” when you say something stupid,or you do something that makes you look stupid.
Also to suffer embarrassment as a result of a public failure.

To have egg on your face: I was so nervous to speak with the boy i like that i said a lot of silly things...Tomorrow i’ll see him again at school, and i have egg on my face..!

On your face

When someone is making a promise or guarantee of something on their face (or honor, similar to giving their word).

If I loan you this money your telling me right now, on your face you will work for me for the next two weekends to make us even.

I gotta go straighten up my face with him by working this weekend and next.