I see I've been mentioned a few times as an underdog xD Hey @troisnyx and @step.
In my experience, I joined Newgrounds on 16th June 2013, last summer. This was actually a day after the auditions thread for last year's NGADM was made, which of course I had no idea of at the time. I'd not even heard of it. Meanwhile people were sending in their auditions for that, I was adjusting to Newgrounds. Uploading some of my music, working out how to get scouted in the audio portal, all that shit.
I must have had perhaps 4 or 5 fans and little over 100 views collectively on all the tracks that I'd posted when a lovely man named @Emil who had spotted my music in the audio portal linked the NGADM to me and suggested I joined. Even when I submitted my audition, I was extremely unaware that I was entering the biggest music competition on this website, yet of course I still didn't expect to go through.
I got through and round by round I was put up against people I'd never met before, musicians whose music I'd never heard. Round by round some of the contestants and I got to know each other. I slowly made friendships with some of the judges and simply followers of that year's NGADM reached out to me and showed me support. Even over a year later, this experience that to most people is just an awesome community competition, hasn't ceased to amaze me. It really gave me direction and molded me as a musician. As somebody who began the competition knowing not a single person in the competition, being granted the title of third place you would think would be near impossible. Although, that's along similar lines of what some people in this thread to be suggesting.
I'm not quite sure I would refer my own self as an underdog or not, but I don't think it has much to do with popularity. Somebody that nobody knows can have equal amounts of success in the community as somebody that is an established musician already. Respect is something a lot of musicians here have in heaps for other people, new and old. I've never felt more at home in such a big place so quickly. Make music, join competitions, reach out to people and be friendly. That is all that is needed.
Peace and love! <3