The small ukulele is traditionally read as lightness, sunshine and not taking life too seriously. Dream books link it to holiday ease and a cheerful, modest kind of creativity.
Has this come up in your dreams before? What was going on in your life then?
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.