When a woman's labia are large, well defined and exposed due to shaving, she has a front crack, similiar to a butt crack in the back. In having said wedge, she now has a front-crack or a frack.
Holy shit, you fucked Betty didn't you Bill? Did you see the frack on her, I didn't know if she was coming or going!
An exclamation used to express frustration. A more appropriate alternative to the “f bomb” or other salty sailor terms. Commonly used around teachers or parents.