Yah! Boo! Snubs!

A catchphrase used once you’ve one-upped your enemies.

"Look!" shrilled Oliver. "Look at Bulgy! He's a mean Scarlet Deceiver!"
Bulgy had turned to leave. They could now see his other side. It had on it RAILWAY BUS.
"Stop!" yelled Staff and engines; but too late.
"Yah! Boo! Snubs!" jeered Bulgy.
He roared away. The unsuspecting passengers waved happily.