Sentence:  "You know what a <WSD>fuck boy is</WSD>, hack. Those weak boys that get forced into sexual slavery in prisons all over America. Their somebody's bitch and they sell them for profit in here. I'll bet you dipped it in the mouth of some poor <WSD>fuck boy</WSD> to mule in some contraband. Tell me it's so, hack." 
Meaning of the word marked with <WSD> tags:  A prisoner who provides sexual favors to a stronger inmate, either as the result of rape or in return for protection and gifts.