A slammed door is read as anger or a sharp boundary drawn. Dream books link it to ending a conversation abruptly, or to feeling shut out by someone else.
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.