A pegboy was a young man kept on pirate ships by pirates. This young man was forced to sit on a large wooden peg...all the time. Anyway, this was done so that whenever a pirate wanted to drop his anchor (so to speak) he'd have no problem.
Come here pegboy, I want some of those sweet cheeks.
a receiver of anal intercourse; someone assuming an unfair share of a burden
Rodney had to drive everyone there AND back, and got no money for gas. He was the pegboy of this fiasco.