attaboy

exclamation

🔊/ˈætəbɔɪ/

(especially North American English, informal)

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used when you want to encourage somebody or show how much you admire them, especially a boy or man （对男性表示鼓励或钦佩）好样的see also attagirl
Word Originearly 20th cent.: probably representing a casual pronunciation of that's the boy.