Mine is a relic of an ill-spent youth as a part of the bike world. It is part of my business name today and has been so for quite a few years so it sticks. I have been called other things, in the past, by various folk but don't wish to use them here as I think it might violate site terms of service and these names were mostly not very flattering. hehe
When I was still on the force, we did a felony entry ( Blue Warrant ) and when I pulled the pin and went to toss the flash bang inside I let it go on the back swing. Needless to say, ever since then the other Officers called me "FlashBang".