A vagina who's sexual activity has been neglected. These vaginas grow teeth and reach out to eat people out of horny desperation. In other words, a pussy gone wild. Variations are the Tyranasaurus Vagina, Mastadon Vagina, Woolly Mammoth Vagina (derrogatory), Hippopodumus Vagina, etc. (Basically anything large and terrifying with teeth will do be creative
, however, sabertooth is the most appropriate because of it's derivative from pussy)
Dude! I need to get laid! I'm starting to grow a Sabertooth Vagina below the waist!