Nickname and how you came about it?

Subject is fairly self explanatory, as indeed are some ppl's nicks, eg GPX Lainie, Plasma Blue amongst others, having said that, some are clear as mud, so this is the thread to tell the world at large how you got your nickname.
Guess I might as well start, as most Vic ppl at least know, my forst name is Michael, prefer to be called Mick, my surname starts with D, ands in Dee, 2 letters in the middle not the same but at a pub I used to be a regular at in Geelong they called me Croc and it's kinda stuck since then.
Guess I might as well start, as most Vic ppl at least know, my forst name is Michael, prefer to be called Mick, my surname starts with D, ands in Dee, 2 letters in the middle not the same but at a pub I used to be a regular at in Geelong they called me Croc and it's kinda stuck since then.