Mysterious Bumper Sticker

I was wondering if anyone knows what a MW bumper sticker means or what it's from. I've been seeing it on a bunch of cars and it's always placed on the left side of the license plate. Not on the bumper but next to the license plate on the trunk. I wonder why it's always placed there, is there a reason or a mere coincidence? It seems too odd to a coincidence. I feel like it's some sort of cult or a secret that everyone knows about but me! It's driving me nuts, I'm almost tempted to roll down my window and ask the person who has it. This bumper stick is black and white/silver. It's a white/silver MW in black circle with a white/silver inner circle stroke. If anyone knows, please help!

Right & Left

I do not know my left from my right.

On another note, I am getting fat according to my family. perfect.