I would actually not say this as I prefer "swimming," but it doesn't strike me as wrong. I've heard people say this before. I think it has to be "diggin" the colloquially shortened form for "You are digging," or at least I assume the subject would be "you" since https://lukasoiatj.blogdanica.com/33724540/indikatoren-für-rhythm-sie-wissen-sollten