The futakuchi-onna has a second, hungry mouth hidden at the back of her head. Dream books read her as needs that have been suppressed until they speak out on their own.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.