A discussion that concentrates on "pipe dreams" dreams or ideas that will never happen. Often occurring when a pipe is passed around in a circle of people. Hence the concept of Pipe Talk
Person 1: "Yeah man, we totally should quit our jobs and travel around the world."
Person 2: "We could get a different job in every city till we have enough money to move on"
Person 3: "...and we can stay at youth hostels..."
Person 1: "Totally, lets do it after you pass the pipe over..."