What does green flem mean?
I believe what is being referred to here as "flem" is really
phlegm, or the thick mucus that comes from the mouth. Green phlegm
can mean a sign of an infection such as a cold or flu, bronchitis,
or some kind of allergic reaction. Usually any kind of colored
phlegm can be a sign of an infection so it is advisable to visit a
health center or doctor if one has persistent colored phlegm for
prolonged periods of time.