Story behind the screen name....
Some time ago, a friend of mine bought a website, recognizing the potential it had. The developer/owner was a dumb kid who had accidentally stumbled into something great, but didn't have any clue how to mange it, so he listed it for sale and my friend bought it without negotiating a penny off the ask.
In short order, he unlocked the potential the site/concept had and it started to gain a great deal of relevance in it's niche. The kid who sold it was completely distraught, realizing how badly he had ****ed up. He went off the deep-end, posting stuff about my friend on forums, about how he had been 'cheated'... After he realized he wasn't going to get any sympathy from anyone for selling a webiste at his own full asking price then feeling 'cheated' because someone managed it better than he did, he started to slander my friend, posting completely untrue and very nasty stuff...
My friend just ignored it, but it took self control.
After a while, the kid had pretty much dedicated every waking moment of his life to annoying my friend... Phone calls, emails, forum posts- the whole nine. He was clearly a VERY unstable person, but we all got a kick out of the show he put on. Finally, my buddy had enough and responded by saying (paraphrase) "life sure isn't fair. You created the site, I bought the site and I got all the money, while you got peanuts. Some people go through life getting donged, while others go through life as the dongsman... In our relationship, we all know who's who..."
After that, he never heard from the kid again who completely dropped off the face of the earth, but the term "dongsman" really made us LOL and became a standard part of our vernacular. In time, whenever one of us booked a killer deal or really aced someone badly, we might be heard to say "I was the John ****ing Holmes of Dongsmen today...", ergo, the av.