when your wearing a pad and you feel a goop of your uterus insides slid out of you
Sally: I just got a period bubble, son of a bitch!
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When a woman has the flu, snot bubbles may occur, period bubbles, may also occur. A period bubble is when a red balloon emerges out of yer fanny while simultaneously having a cold and on your period.
Little girl: "Mommy! I just got my first period bubble (:!"
Mommy: "You are a period bubble."