Subsequently, it could also be a blog by the same type of person because people like this think everyone wants to hear their opinion.
The phrase comes from the title of the final track off of Van Morrison's Astral Weeks and a quote he used to describe what the song was about.
Person B: Let it go, man. They're just a bunch of slim slow sliders, caught up in themselves and a their long journey to apathy.
Person A: I'm thinking about starting a blog because I've got all of these awesome things I want to write about, like indie films and drugs and music and books and interesting films and things. I know people would want to read it.
Person B: What, like a slim slow slider?