No one has a clear idea of what exactly it is - only its relative speed. Used specifically in reference to something that is faster.
Big-Dan's teeth are faster than a Nun's nugget... He even proved it on stage with Mischief Movie Night In!
by TattooedCookie February 01, 2021
My teeth are faster than a nun’s nugget
by Trunchbull1969 January 31, 2021