I think setting nicknames has something to do with the state of someone's mind at the time. So here goes mine:
Lonely_Puma - Average guy. So not a lion or tiger but not a house cat either, something in between like a Puma which just tries to mind its own business, a specialist with a wide range from pine forests to high mountains.
And as far as Lonely is concerned, well at the time I was genuinely looking for companionship but after a while I've gotten over it and I'm not actively looking although I'm still single :). I'm thinking of either changing this to Pak_Puma or if I can't change it I might make a new one. I've come to think what will I do if I get married, what if my wife asks me why I'm still lonely?
Or maybe just leave it as it is, at least through this thread my clarification has been added. 