I haven't had my cycle in 4-5 months but my tubes are tied what can that mean?

Many things. Pregnancy should always be ruled out first. Just because your tubes are tied, does not mean you cannot get pregnant and if you do, you are at increased risk of a pregnancy that is not in your uterus. It could also mean that you are not ovulating regularly; either peri-menopause or other reasons. See your doctor to determine why you are not having regular cycles.