When my two oldest girls (I have four girls) were younger, around 6 and 8, they were calling everything "of doom".
We had the "dog of doom", "peanut butter and jelly sandwiches of doom", "house of doom"... it went on and on. Of course, I became the "mommy of doom". Even now, 7 years later, they continue to joke around and call me the mommy of doom ("and we're doom!" lol).
So, it stuck. Makes for a great user name, and I even still sign some cards to the kids as "
mod". I also sometimes just sign the symbol % which is the modulus operator, or "
mod" in mathematics. (Yes, I'm a math geek.)