something women put in their vaginas to stop menstrual flow (blood) from going into their underwear. tampons are comfy and can be nice because you can swim in them. although comfy, they don't tend to be popular to girls that have only recently started menstruating because they're worried about something being stuck up their vagina and losing their virginity.
Girl: crap! i just got my period. where's a tampon?
Guy: don't say stuff like that.
Girl: oh shut-up. *goes into her backpack and takes out a tampon* i'll be right back, i just need to put my TAMPON in, then we can finish doing our homework.
*says the word tampon deliberately just to annoy the guy*