The act of walking into a bathroom stall, only to notice there is some kind of fecal monstrosity in the toilet. You then proceed to the next stall, only to see the same thing again. The process repeats endlessly, often causing several bathrooms explorations and perpetual cycles of stall infiltration, hence the term "journey". Most likely to occur in a high school, stadium, or night club bathroom.
Person 1: "I hate the bathrooms here at this stadium, no one cares enough to flush so I'm always going on a twenty minute stall journey".
Person 2: "Yeah, It's like I'm on a magical quest to find a porcelain treasure chest not filled with poo."