/ˈfəkˌboi/
noun
In U.S. prisons fuckboy is an insult to ones manhood implying that within the prison the insulted is a bottom for homosexuals. The role can be consensual or involuntary, and is the condition that follows being turnt-out. It is often used in the jails by veterans of prison to scare young men who have not yet been sentenced.
synonyms: bitch, punk, sissy, ho
antonyms: solid, bro, cracker, trained to go
The first time i heard this term used was during a 6 month jail sentence from October 2012 - April 2013. I think it predates any other recognized etymologies.
When we get to processing i'm going to introduce you to a guy called Black Brock Lesner, and he will protect you as long as you remain his fuckboy, so start stretching your ass now cause his dick is the size of a radiator hose.
A Mexican Fuckboy is a Mexican guy that plays with girls feelings, flirts with girls even if their girlfriend allows it, does drugs, wears Suavecito, and can be found skating or playing soccer.
Some common Mexican Fuckboynames are Pablo, Juan, Alex, Luis, Emmanuel, Omar, etc...