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.
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