A "hollaback girl" (or boy depending on the case), is a slang term used to describe a certain physical malady that afflicts about 2% of the teenage American population (who cares about the rest of the world anyway). Hollow Back, or Hollaback as it's come to be known, is a serious and painful fusing of the lower 15 to 20 vertebrae. This "locking up of the back" causes a serious deformity of the lower back that when viewed from the side, creates a cave-like or almost hollow appearance to the lower back.

If hollaback is neglected, the curves may progress dramatically, creating significant physical deformity and even cardiopulmonary problems with especially severe curves. Currently, hollaback is treated successfully by special braces, electrical stimulation, surgery, or by combinations of these three techniques. Strangely enough, a side effect of Hollaback, is long and cylindrical shaped feces - much like a banana.

So when Gwen says that "this shit is bananas" she is dead on and knows her hollaback.
That ugly girl, with that smear of shit on her leg, has hollaback and is a good candidate for hollaback surgery.
by MonkeyPiePdx August 24, 2005
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A "Hollaback girl" is a female who hollers during sex, especially in the "doggy style" position, usually in an annoying way. Although some guys like it.
Shhh! baby, my mother is in the other room. Now's not the time to be a hollaback girl!
by John Jackel March 16, 2006
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a 40 year old fish dog that wears custimary dick jewlery tht feeds on the small boys who walk around in the dark at nite
Holy crap, watch out for the hollaback girl!
by lolster123456789 August 8, 2009
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madonna. her faith in the kabbalah has dubbed her "hollaback girl" by gwen stefani, because "hollaback" is "kabbalah" backwards when pronounced.
madonna is a hollaback girl
by will00006 August 17, 2006
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A common mispelling for "Hollandback Girl" as Gwen Stefani didn't make it too clear in her lyrics...

And anyway, it means a cheerleader who tries to be heard, but just becomes part of the background noise.
A few times I been around dat track so its not just gonna happen like dat cos i aint no hollandback girrrrrl i aint no holandback girrrrl
by dudeos May 23, 2005
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A hollaback girl is the type of girl where if you get in a fight with, they won't hit... they will only holler at you.
Gwen stefani as in not be a hollaback girl... she heard that a girl is talking about her, so instead of hust hollaring back, she is going to beat the girl's ass.
by The better Kristi July 22, 2005
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A wannabe. Someone (male or female) who imitates others in a certain group so as to try to be like them, though they clearly aren't.

A person with low self esteem who is unwilling to accept who they are, with the attributes God gave them. Consequently they experiment imitating others hoping to be accepted by that group.

A follower as opposed to a leader.

Gwen Stefani pointedly states that she ain't no hollaback girl. In this example, the cheerleaders are the real thing. The girls in the stands that repeat back what the real cheerleaders chant are the hollaback girls. The hollaback girls wish they were cheerleaders and try to be like them, but they just aren't popular enough or athletic enough or don't have the right look. Gwen deems herself to be the real deal, not just a wannabe.

To refer to someone as a "hollaback girl" would be considered an insult.

by Brother Woody January 26, 2008
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