In DSS (digital satellite) testing, it is when you try to flash the bios in a FTA satellite box such as a Pansat, and the bios fucks up you box, resulting in the box becoming unoperational, and the LED display on the front of the box doing nothing but flashing back and forth like the front of KITT from the TV show Knight Rider.
It can also be used for any situation that features lights that flash in a back and forth manner.
Damn, I got the wrong bios for my box and now its's Night ridering!
What's that sign thats night ridering up there on the roadmean?
Also a term which refers to shedding an incredible amount of tears capable of making a river. It is usually used when telling others about extremely sad things.
"Hey, did you read that Thorki fanfic I told you about?"
"Yes, and the feels were too much. I was rivering so hard, my poor babies."