Yes, I have been the "big dick of the party" at parties during my college years. While at college, I played on the swim and tennis teams, both of which had older female groupies, who happened to be very wealthy with a lot of time and money to lavish on young, male athletes. I was introduced to these parties during my freshman year.
One night after swim practice the rookies were told of a party to which we had been invited. We were also told it was speedo-only. At the party, the guys would quickly change into their speedos, then meet our adoring groupies. The same would happen with the tennis parties, except there our dress code was jockstrap-only.
As time passed, some of the groupies would gravitate to certain guys, and, see us at times, other than the parties. One woman invited a few of us to a party that she was giving with a white y-front briefs only dress code. From seeing the other guys, many of whom I did not know, it was obvious that we were all big between the legs, and, presented nice bulges.
Over the course of the evening, the guys became rather drunk. At this time, the hostess had the guys stand in a row. The women came over to us, and, on a signal pulled our briefs down. The women then proceeded to measure us: length, girth, hang of our ballsacks, size of our balls. In my drunken stupor, one told me that I had won on all categories.