quectopenis

The smallest possible penis according to the current set of SI prefixes, smaller than even the rontopenis. A quecto penis is to a penis what a penis is to a quettapenis, making it one of the smallest objects in the known universe. Not even God Almighty can save a poor soul with a quectopenis.

Dude 1: What is it? Is my son okay?
Dr. Dingleberry: He would be, yes, but I'm afraid he has a quectopenis. We need to graft a proper penis over it to ensure he can urinate correctly.
Dude 1: FUCK!