1 definition by Mr. Smartypants
A girl with no personal strength, i.e., 'no spine'. Hollaback is slang for 'hollow back', which refers to being weak or figuratively having no spine.
In Gwen's song she says she aint no hollaback girl, she's saying she's going to stand up to her accuser.
by Mr. Smartypants November 7, 2005