(n) 1. The progressive loss of higher mental functions, and eventually motor skills, due to overuse of one's love muscle for thinking with.
A highly infectious condition spread by exposure to hot chicks, who are asymptomatic carriers of the disease.
Bob: As I was saying, infection of the lymphatic vessels may cause thickening of the skin and enlargement of underlying tissu... WOAH, BOOBIES!!1! .... Huh?
Bill: Oh noes. Another innocent, struck down in his prime by rampant penility. Where will it ever stop??
When your penis grows to be too big and causes the nerves in most of your lower body to go directly to your penis, therefore there are not enough nerve endings in your legs and feet causing the person to have extreme difficulty walking or performing simple tasks involving the legs or causing the legs and feet to be rendered completely useless in more severe cases. Penisitus is usually self diagnosed and incurable.
If you keep eating all that meat with growth hormones in it , you're going to get penisitus before the end of your puberty.