This has probably been asked before but I wanted to add another layer/an alternative.
So, I ask, where did your username/pseudonym/nickname originate from? What’s the meaning behind it?
Or alternatively, which is the most creative/interesting nickname origin you have come across?
M is the letter my real name starts with, and 137 has been my favourite number since I was a kid, and I still think is the coolest number (has nothing to do with 1337, as some people have previously thought).