Drooling is read as strong desire or appetite, and as a slip of composure. Dream books see it as wanting something badly, or as embarrassment over losing control.
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.