The word cangina is a compound word combining cannibalism and vagina. On a physical level it describes the act of a vagina eating human flesh, and on a metaphorical level it refers to a man with the appetite of a female.
Danny: My penis hurts from last night, that girl had a cangina...
Dustin: You're such a cangina, stop being a dick and eat more protein.
A mother-fuckin, man-eating, floppy vagina ...
Some cases so severe that the cangina develops fangs and/or claws
That bitches cangina bite my fucking arm off !!!