furious facial expression; face like a demon
Describes a terrifyingly angry face, often used when someone is enraged or glaring fiercely.
He came in yelling with a furious look on his face.
He glared at me with a demonic expression, and I instinctively stepped back.
Literally 'the face of an oni (demon)'. The phrase uses the image of a fearsome Japanese demon to describe an extremely angry facial expression.