Derived from the italian suffix -issimo, meaning "extreme" or "remarkable" and the english root penis, penissimo means an extremely large or remarkable penis, one that is pleasing to the eye, and a woman.
A small man with a giant ego and a even smaller penis. Arrogant, unknowledgeable, illeterate, incompetent, moronic, illogical, can be seen making monkey faces and picking his nose on live TV. Directly releated to, dickhead, penisface, ignoramus, pinnhead and superchicken.