Sudden Messaging Syndrome. This debilitating disease begins shortly after receiving one's first moblie phone. The sufferer is completely unable to perform ordinary tasks or social activities. People with SMS typically can text very quickly, because they spend their whole day doing so. SMS can easily lead to becoming broke, since the phone bills SMS sufferers get can total into the thousands.
Greg: Why does Bob never go out anymore?
Tom: Aww, man! he's got SMS. :(