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When a rat inhabits the vagina of a women, living or dead, and feeds on the vaginal walls.
Girl A: "I have to see the nurse"
Girl B: "Do you feel sick?"
Girl A: "No, but I have a ratgina"
Girl B: "A what?"
Girl A: "A ratgina, here, look"
Girl B: "Holy fucking shit!"
by Fernando "El Gallo" Soto August 22, 2008
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