I don't know how far this thread will go. Everyone here knows who has the biggest dicks ever filmed. There is about two grainy videos on monstercocktube that feature some huge solos, but after that you have Mandingo, John Holmes, Dredd, Quercuesone, Shane Diesel, Matt Hughes, Kid Bengala, Mr. Big, Shorty Mac, and a couple others and that's it (that arent fake of course).
Anything else big that has ever been filmed usually gets posted on LPSG first.
But if there is anything new or undiscovered that is bigger than the above mentioned, I'd love to see it but you are talking about one video per year average that this happens. I hope I'm wrong but probably not if history is any indication.