noun
smug face; triumphant look; self-satisfied grin
Colloquial term for a facial expression showing smugness or self-satisfaction, often after a success or when showing off. Similar to したり顔 but more casual and modern.
See also: したり顔 (したりがお)
彼はテストで満点を取って、ドヤ顔をしていた。
He had a smug look on his face after getting a perfect score on the test.
自慢の新車を見せびらかすときのドヤ顔が忘れられ
I can't forget his self-satisfied grin when he was showing off his new car.
Derived from the Kansai dialect expression どや (meaning 'how about that?' or 'look at this!') combined with 顔 (face). The exact origin of どや is uncertain, but it is associated with showing off or seeking acknowledgment.