Despite popular belief in the caucasian suburbs, Gwen Stefani did not invent the term "hollaback". At its most basic level, it simply means "Get back to me on that" (holla back).
Gwen Stefani's usage of this term, hollaback girl is a different one, however, which implies that the girl in question is all talk.
Diego: Bianca, I heard Chauna has my math book. Tell her hollaback.
Rita: If you see Mary, tell her to hollaback at me.
By Odilia
Hollaback
The subordinates in a group. When there is a group of people that hang together a lot and one of those members is very dominating and controlling, other less forcefull members just tag along, do and think what they are told. Derived from high school cheerleading. The captain hollers something and all the other cheerleaders holler it back.
An abnormal forward curvature of the spine in the lumbar region. Also called saddle back - 'hollaback'
By Ellen
Hollaback
The (often provocative) arching of the lower region of the back, making the lumbar area "hollow" - thus 'hollaback'. This action thrusts both the buttocks and chest area out, and is a classic cockteaser pose.
Lookit that hollaback girl! Stickin' her ass an' tits out...I'm goin' to take her from behind, man! She WANTS it from behind, that hollaback girl!
By Sharity
Hollaback
Someone who is inferior, low class, has to "answer back" to people above them
Derived from Cheerleading:
The captain of the cheerleading team leads the others:
Captain: "Give me a "B"
Team: "B"