There's a common belief among motorcyclists that having loud exhausts help alert other car drivers of their presence, making them more visible on the roads. There are various arguments in favor and against that notion, but if it's getting you to notice them I guess it is better than nothing.
I'm imagining a product owner and a bunch other stake holders sitting in a meeting room adding a bunch of keywords to each emoji. Or just copying a list from somewhere on the Internet and filtering it (my bet would be on this).