counting the days to your period to determine whether you will have it for some important event (vacation, date, etc).
girl 1: Ready for our all-girl cruise next month?
girl 2: Yes! I just did some menstrual math, and I won't have my period until we get back!"
A tampon that has been left in the vagina for too long. If a woman does not take out her tampon soon enough, infections can happen quickly, hence a "Menstrual Missile".
Amy: Why did you call me over here?
Anna: I went to a party last night, forgot to take out my tampon. Got myself a Menstrual Missile.
A good band name for a group of mostly gay teens. They collaborate opera and glam rock, because why not?, they are the menstrual cycles after all.
Person 1: What will we name our band?
Person 2: I don't know, the menstrual cycles.
Did you go to the menstrual cycles concert last night, it was amazing, the way they collaborated opera and glam rock was fantastic
Did you get the new menstrual cycles record, my favourite song on it is either fertile days or the uterus song
The act of putting a used tampon in your friends mouth when they are sleeping.
"Brad fell asleep at the party first, so i gave him the Dirty Menstrual "