"Rickets" is a physical deformation, often characterized by an outward curve of the long bones of the legs (brought about by Vitamin D deficiency). The term "Dick Rickets" can be used to describe a situation where one's erect penis is bowed dramatically in one direction.
Note - unlike classic "Rickets", to date, "Dick Rickets" has not been linked to Vitamin D deficiency.
Example 1 :
Woman #1 - "I heard he's got a huge penis..."
Woman #2 - "Yeah, but he's got dick rickets...sometimes it feels like he's divining for water."
Example 2 :
"The guy's got dick rickets so bad, he can piss around a corner without using his hands!"