When one becomes sick with a "I don't give a fuck attitude." This usually occurs after someone has been tried one too many times or has become extremely intoxicated. This syndrome usually begins in the left calf and quickly spreads throughout the body. This term was invented in Florida during the Master P era. Master P was always talking about his soldiers and when the question arrose after a long night of drinking "How does one become a soldier." Getting infected with soldieritis of course!