A derogatory term used by prison inmates used for a convicted and incarcerated pedophile. Surprisingly, 'Skinners' are very reviled by prison inmates and are often segregated from the rest of the prison community to protect them from other prisoners.
"Inmate #190203 ain't nothing but a scumbag skinner. He raped a little 6 year old boy in Alabama. If I ever get my hands on that skinner I'm gonna kill him"