noun
funny face; silly face
Casual slang for a deliberately distorted or comical facial expression, often made to amuse others or in photos.
写真を撮るとき、みんなで変顔をした。
When we took the photo, everyone made funny faces.
彼はいつも変顔で笑わせてくれる。
He always makes me laugh with his silly faces.
Compound of 変 (へん, 'strange') and 顔 (がお, 'face'). The reading がお is a rendaku form of かお.