One of the troubles with being a terrorist bomber is you don't get to choose your own nickname. The media or law enforcement do it for you.
That had to bug ol' No. 2 a little, while he was cowering in the boat, bleeding, waiting for a Boston cop to pop a 9 mil in his forehead. He'll go down in history as the weasely punk loser who killed an 8-year-old child and two young women and, to top it all off, now has the nickname of a bowel movement.
Seems if you're going to be a bomber, you should leave a note or a manifesto, and give yourself a nickname like boxers do to avoid just that kind of embarrassing situation.
So these idiots could have been Tamerlan "Sweet Pea" Tsarnaev and Dzhokhar "Money" Tsarnaev. But I guess they were too busy building bombs, reading Jihadi websites and hating people to worry about marketing. Besides, I'm thinking "BM Bomber" is very appropriate.
In fact, it's way too nice.