extreme code. u r in serious danger if u are in the vicinity of a person that is this code. a person is named this code when they are extremely hostile or very annoying. it was first developed in the army as a way to scout out for germans in WW2. then was renamed again in the veitnam war when it was used to describe a soldier that nobody liked. the word is still used to day in various parts of the military. also, remember that if u happen to se a "code 49" u should run for ure life IMMEADIATLY.