When a woman is so obese that the fat rolls topple down over the top of her vagina like an avalanche.
Guy #1: "Man, Char has gotten fat."
Guy #2: "No kidding. Before heading in you'd need a condom and a GPS in case of a vagalanche."
multiple vag, getting with a lot of women, an unheard amount of sex,
hey jim that car is so awsome you may cause a vagalanche