To become excited, angered, resentful, or another strong emotion, as a result of another(s)' instigating it and/or stirring it up around.
I heard that you were talking shit
And you didn't think that I would hear it
People hear you talking like that, getting everybody fired up
So I'm ready to attack, gonna lead the pack
Gonna get a touchdown, gonna take you out
That's right, put your pom-poms downs, getting everybody fired up
Lyrics from "Hollaback Girl" by Gwen Stefani.