My tampon is gunna pop out!
When something is so ridiculously funny and you laugh so much you exert force from your vagina and it feels as if your tampon would pop out.
Person 1: *Does or says something extremely funny*
Person 2: *Laughing with so much force and gasping for air* Stop... I can't breath... my tampon is gunna pop out!
Person 2: *Laughing with so much force and gasping for air* Stop... I can't breath... my tampon is gunna pop out!