ATTABOY

(slang) an exclamation of approval or encouragement. (A corruption o f "that's the boy," this expression is also seen as "that's a boy" and "thataboy.") —SHSBC Binder 13 Approved Glossary

(slang) an exclamation of approval or encouragement. (A corruption of "that's the boy," this expression is also seen as "that's a boy" and "thataboy.") (slang) a variation of that's the boy. See that's the boy in this glossary.a variation of that's the boy.