Cat Willy

British, informal.

A childish or jocular but ultimately endearing term for someone who has a human penis matching that of a cat.

Typically, it is expected that in this instance the human possesses a penis that is small, with little impact on the world or the underwear it occupies. See also "Cat Cock"

"Alright Cat Willy?! What are you up to you fucking small-dicked little wanker?"