Turn Me Slowly

So we went to Uluru(Ayers Rock) on the weekend and met up with the manager from the Docker River store-Gavin. Gavin is the son of Maureen and Derek who work with us at the store. So we met up and had a few drinks on Saturday night. While we were drinking and talking about each others communities, Gavin told us a good story. Apparently he had an aboriginal come into his story and asked him for a "turn me slowly". Gavin looked at him and said "what?" He said I need to buy a "turn me slowly". Gavin says, "look mate I have no idea what you are talking about!" So they guy tells him to come outside. So he follows. The guy then opens the hood of the car and points to the radiator cap. On the top of the radiator cap reads "Please Turn Slowly". So you know what it is if someone asks you for a "Turn Me Slowly"!!