The disease you develop after a long period of time spent on the couch.(mostly because of injury) People that suffer from this become sick in the head and are very irritable. Common behaviors are swearing, talking about violence, yelling, and frequent masturbation.
Tommy broke his leg and spent the whole summer on the couch. He spoke of purchasing fire arms, started wearing more flannel than Al Borlin, and masturbated so much he lost interest. This is a prime example of going couch crazy.