A GIF repeats the same short moment again and again, so it is read as a thought or a feeling stuck on loop. It can also stand for humour used to say what words cannot.
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.