Surprisingly enough, my mother is the one who referred me to the Urban Dictionary which properly defines a “hollaback girl”. The main definition is as follows:

1. hollaback girl

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.

Other definitions include:

2. hollaback girl

An attractive girl but not the cream of the crop.

When Tom sees Julie at a club, He hollas at her because she looks good but then when he sees Becky he forgets all about Julie. At the end of the night Becky won’t put out so he ‘hollas back’ at Julie.

And a personal favorite:

3. hollaback girl

A term that Gwen Stefani apparently just made the f*ck up and tries to pass on as regular slang.

Ohh look at me I’m Gwen Stefani blah blah blah blah HOLLABACK GIRL blah blah blah