I first used the nickname mcgameboy way back in 2000, IIRC. It was basically when I first started playing online poker.
It was to play some freeroll tournaments using the very old PokerPages software.
The thing about those Poker Pages freerolls that was pretty awesome was that the overall winner would get a seat to the WSOP Main Event, which back then, was a VERY BIG deal for an amateur/freeroller. I even remember the name of the guy who won it. He was a Brit called Mark Leah aka slimmouse.
And by winning this PokerPages tournament, he achieved a famous first. He was the first person to qualify for the WSOP ME via online poker.
And then he became the first person to do that twice (he qualified again in 2001, at Pokerstars, the year they were launched).
Anyhow, enough of the history lessons.
The mc part of my name comes from my initials.
And the gameboy part....well I'm just a big kid at heart, who loves to play games (video, board, card, whatever).
I do seem to remember owning a Nintendo (a Super NES) at the time, but mcsupernes would have sounded proper naff, so I went with a different Nintendo product instead (Gameboy). And I guess it just kind of stuck, mainly because I'm a proper lazy so and so lol.
And yeah, there have been times when I questioned the creation of said username, especially when playing online poker.
Win a pot at the expense of the wrong guy and I would end up getting called mcGAYboy instead (if poker chat transcripts were to be taken as absolute gospel, then I must be the gayest straight guy on planet Earth).