There have been some ugly ass male porn actors over the years that were hired solely for their monster dongs. Don't know their names off the top of my head, thank God. There was also a series, I think it was from the mid to late 2000s, called The Minion, who was an ugly fatass that would bang the porn stars of the day, with the idea that it was humiliating for the women to have to fuck him. Sometimes he would be eating sandwiches while getting blown lol. His dick was tiny too, made even worse by his protruding gut.
Another thing that could be close to what you have in mind is "fuck a fan" content. I've never seen much of it myself, so I don't know how much is legit or totally fabricated, but I've seen a couple on Efukt showing some really bottom tier guys banging the porn stars.