Doya-gao (ドヤ顔) is a facial expression conveying a self-satisfied, cocky, or smug attitude. To enhance the comedy effect, one may use this expression on a silly or innocent character.
Doya probably comes from Kansai Japanese "Dou ya?" meaning asking someone "How well am I doing?". The phrase carries an inside meaning of "I looked cool just now, didn't I?"
The following tags are aliased to this tag: doya-gao (learn more).