Quote from website…
They were talking about putting the sounds of a motorcycle into words, “how does your bike sound”.

This is the one I liked the best, and it suits my bike too.

as it breaks 6000rpm, it changes from ‘grrrrrrrrrrr’ to “Attention lesser road-going vehicles, you are slow, inadequate, and in the way. Please evacuate my intended path of travel, and I may be merciful.”