A phrase used when you don't want to say "I'm on my period" out loud.
Girl A: Hey, wanna come ice skating with me today?
Girl B: Sorry, I can't. I'm spewing sauce. (sighs)
Girl A: Oooh, that sucks.
Girl B: Yea, you know how bad it would be if I were to open my legs while skating. It would be the eruption of Krakatoa all over again.