That’s a recurring question I get asked: What does “mraw” mean?
Over 2 years ago, I changed my mail signature from the traditional:
I became a DD back then, so I put my now-become-my-login-as-well nickname there. About the “mraw” part, I kind of like felines in general, and felis catus in particular. Onomatopœias like “maw” or “meow” are nice, but that’s even cuter when there’s some purring happening at the same time, hence the ‘r’ addition in there.