When a guys dick is so small it's barely exists.
What's up with J? Sue hooked up with him and said he has a Pluto dick.
A dick that was once classified as a standard dick to one so small it is no longer classified as a dick. A dick too small to be seen with the naked eye.
She was expecting someone with a little more than a Pluto Dick. It's so small it cannot be seen by the naked eye.