A lice ridden scavenger that feeds off the work of others.
In Sheryl's case, that comparison is partially true and partially untrue.
It's true in the sense that she gained her first musical fame by ripping off another songwriter who became so distraught over being screwed by her he committed suicide. (He didn't know what had happened until he saw her performing on late night TV claming his work as her own.) The songwriter's friends and parents blame Crow's plagiarism for his suicide and won't speak to her even after all these years.
It's UNTRUE in the sense that she WORKED it HERSELF, like a woman works the streets: she slept her way to record deals in the sack with the likes of Eric Clapton and others, and the groupie then became a star herself.