Vagina bubbles from hell!
Oh! I get it, a squirter! (if you don’t know what that is you’re probably too young, come back in a few years ;)), or a dirty ninja hoe. This glorious scene is from “Kunoichi ninpô chô III: Higi densetsu no kai,” aka “Female Ninjas Magic Chronicles 3.”
Anyway, thank you Japan, you have freaked me out once again, cheers.