1. (Australian slang) The act of having a whole group of friends (or fellow potheads) bundle up into a car (preferably a full passenger load) and all smoking marijuana, preferably with the windows wound up, as to have the car's interior thick with both a bong haze and steam from the bods sitting in the said vehicle! And having no fresh air coming in, one can get get stoned both on the toke and the haze. Great in a panel van too!
Before the concert, we all piled up into Jack's car and had ourselves an almighty Dutch oven: faaaark, we were ripped! Phwooooar!