Attaboy interjection exclamation
"Attaboy" is a contraction of "that's the boy";
Also: "atta boy."
Opposite phrase: attagirl/ attagal
A short phrase spoken suddenly and loudly to cheer a boy, man, or male animal on.
Yes! You've made it! Attaboy!
Keep moving head! You are very close to the finish line! Yay, you've won! Attaboy!
Attaboy! You've broken the world record!
This interjection dates from 1909. It was originally used in baseball as a cheer of encouragement or approval.