My avatar choice was chosen for reason's not so much different as your own. A lot of the more passionate fans of the Turbo and PC-E, like to express that feeling with a unique name of something associated with those consoles or games that were exclusive to the consoles.
I had some good ideas but, most of them were taken so, I started flipping through my game manuals to find a suitable name that only a TG16/PC-E fan would recognize and that's when I remembered that Blazing Lazers featured some enemy ships and stuff in it's manual with names.
The Shrapnoids are the meteors that burst into smaller shrapnel-like meteors that home-in on your Gunhed ship after you fire on them.
If you're battle skills aren't that good or your weapons aren't leveled up enough then, you're better off dodging the Shrapnoids.