Way too many incorrect defintions Caucasian people are making up on their own. A fuck boy is a term that originated in prison, pretty self explanatory, a boy used for fucking... in jail. More correctly used as "Fuck Nigga". This term became popular among Caucasians recently due to the newer generation of kid major preoccupation with hip-hop/rap music & culture, hence all the horribly incorrect and made up definitions
Look at all these fuckboy's typing up fake definitions of the word fuck boy on urban dictionary.. SMH!