A hidden stash stands for reserves kept back for a hard day, or a secret you keep for yourself. Finding someone else’s is read as uncovering what they have not shared.
Where in your waking life have you met something like this lately?
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.