What does it mean when you start to have your period but it smells bad like death with black goo?

What a description!: One of the first things i look for when a woman complains of really bad vaginal odor is a lost tampon! sometimes a tampon is placed in the vagina, the string gets tucked inside, and a woman can forget it's there. After a while, the odor can be quite strong. But it's also possible that there's an infection present, and it would be very wise to have this checked by your doctor. Good luck. Lgromkomd.