One who has a unusually large penis, usually a younger gentleman.
Did you hear that Abe Lincoln was quite the donkey boy?
Holy crap! Look at the size of that donkey boy's package!
someone appearing in a donkey like manner, much like the donkey off Shrek. Very ugly person who is a dumbass and isnt as great as he thinks he is.
Guillermo "Emil" Verde is a Donkey Boy.
Man Brigette Miller sure looks like a Donkey Boy too!