Inphallusable 

Is used to describe someone who is very knowledgeable on the subject of the male genitalia.

Gibson is inphallusable therefore he knows why his penis is minuscule in size.

Inphallusable by Benisbigolgaaayy September 27, 2019

inphallicable 

Unlikely or impossible to be penised.

'Jerry was in prison for several years, but was never raped because he is so inphallicable.'

inphallicable by Mikey to the S April 12, 2008