attaboy
exclamation /ˈætəbɔɪ/
/ˈætəbɔɪ/
(especially North American English, informal)- used when you want to encourage somebody or show how much you admire them, especially a boy or man
see also attagirl(对男性表示鼓励或钦佩)好样的 词源early 20th cent.: probably representing a casual pronunciation of that's the boy.