The phrase "clown face" refers to someone's exaggerated or ridiculous facial expressions that resemble those of a clown. It is often used to describe someone who is making funny or silly faces.
Sentences with «clown face»
You have to invest in a small mirror or you'll wind up in clown face. (amidprivilege.com)
It wears a keen and determined expression on its characteristic clown face. (modernpuppies.com)
Seeing the big clown face was (at first) too obvious for me. (theinspiredroom.net)