A vagina that has evolved in such a way as to be able to physically envelop and even devour men.
Similar to the mouth of the Queen Xenomorph in Ridley Scott's "Alien" the manga flaps fire from deep within the vagina and latch on to any man within striking distance sucking them dry of semen and other bodily fluids. Once drained, the manga flaps disgard and quickly forget their quarry and move on in search of further prey.
Her pork chop piss flaps were still covered with broccoli. I'm a fucking pork chop piss flaps. I fucking love my pork chop piss flaps. I swear to Jehub that my pork chop piss flaps were on fire. I love my piss flaps.