It seems as though Ms. Stefani has had some incidents in which another young, presumably female, individual has made some disparaging remarks about her character. Upon learning of the situation, Ms. Stefani is informing this “culprit” that she intends to handle this matter physically. Ms. Stefani’s character is such that she is not the type of person who counters verbal attacks with verbal attacks, or “hollering back.” Using terminology that is commonplace among today’s youth, this is shortened to “hollaback.” Additionally, it appears as though this altercation will take place somewhere near the bleachers.
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