"Hokahey" is a man's exclamation in Sioux, similar to the American expressions "Let's do it!" or "Let's roll!"
The reason people think it means "it's a good day to die" is that the Lakota Sioux leader Crazy Horse famously exhorted his troops "Hoka hey, today is a good day to die!" Which meant something like "Let's go men, today is a good day to die!"
A meaningless, unimpressive, self-serving introduction. An indicator that the story about to be shared will be pointless and dumb.
Back when I lived in upstate new york, I also had to park on the street - on two occasions, we got enough snow, mixed with just the right plowing, that my car was lifted off the ground from so much snow being jammed underneath it.