Wow, you guys have no clue. "Goon" is gang terminology for a low level gang member (fyi, gangs have a hierarchy). These low level gang members are usually the street drug runners who work for a boss that is much less visible than them. For this reason certain things are implied in a goon's responsibilities : the goon's are more visible so they "take the fall" for their bosses if some transactions were discovered by police - the goon would take the arrest and never snitch on his boss. The boss (usually much older ) would usually bail the goon out of prison if he should be caught on a job. The boss keeps himself as far away from the "prosecutable action" as possible (see young joc's ref to this when he says "keep my hands clean cause I never touch dope" ). For this purpose of taking the fall, goons are usually preferred to be younger and are often under 18 (to avoid having to be charged/serve time as an adult if caught). Another purpose other than deals is carrying out hits - the goon will never admit who he works for - this helps so that if he is suspected for a murder, it's hard to prove because there is no motive. In a gang organization (fyi gangs are organizations for organized crime just like the mophia, they just don't get that same dark honor for... some reason). This is what is being referred to in Plies's song when he says "born a real nigga, but I'mma die a goon".
And by lil wayne in "A mille" when he says, "I go by them goon rules: if you can't beat'm then you drop'm". FYI Plies, lil wayne, bird man, and gucci man are all Bloods (see lil wayne's verse in shory lo's "they know" remix when he says, "Su-Wu gang, and if you aint wit it then you in the food chain.." (su-wu is a term for blood gang members).
I'm a real goon - I'll die for my boss and die before I snitch.