Usage patterns
得々と〈動詞〉to do something (say, talk, explain, etc.) in a smug, triumphant manner
He talked smugly about his own success story.
得々として〈動詞〉to act with a visibly self-satisfied, triumphant air
She proudly showed off her certificate with a smug air.
得々たる〈物〉a triumphant, self-satisfied (expression, attitude, etc.)
He began speaking with a smug, triumphant expression on his face.
