What does "crossing the stream" mean? I have been through "Cross the stream where it is shallowest" but I also sometimes see this phrase without the "where it is shallowest" part. For example, today I saw this phrase being used in one of the comments in Stack Overflow:
With negative weights Dijkstra I found the most expensive path in the graph: one that crosses the streams.
Best Answer
Score one for dumb guesses. Specifically in the link you've provided, it's a reference to Ghostbusters (as in, the film) :D
Roughly translated, it's along the lines of "that's a really bad thing you're about to start doing/are in the process of doing"
Specifically, early on in the film there's a scene and some dialog which introduces the concept of "crossing the streams" as a Very Bad Thing. The relevant quote is on IMDB here in all its glory and here's the video clip.