a face reminiscent of a muffin in some way; spec. an expressionless face; a person having such a face.

figurative and in figurative context. A human face regarded as resembling a mask, esp. by being fixed in a particular expression.

= muffin face n.

an impassive expression that hides one's true feelings; a person with a poker face.

An expressionless or impassive face, esp. one deliberately assumed; also, a person with such a face; the assumption of such a face.

A face that is expressionless, impassive, humourless, or disapproving; a poker face. Also: a person having such a face.