Kah Kah
When 'boo's' are just sad little whiners who need to stop crying and start yelling 'Kah Kah' like they're in a superhero movie.
That 'boo' in the back of the class needs to turn into a Kah Kah or I'm gonna steal their lunch money.
If my little sister keeps booing, I'll make her a Kah Kah and she'll be famous.
That 'boo' is weak. Kah Kah is strong. Kah Kah is cool.