This likely refers to a volume number, a specific date (February 6th), or a part of a multi-segment file upload (Part 2 of 6).
Unlike modern aesthetics that focus on fashion, "horsecore" in the 2008 context usually referred to a specific subgenre of music (a chaotic blend of breakcore, noise, and experimental electronic) or, more likely, a specific internal naming convention for a community project or file dump.
It is possible that the searcher is looking for a specific video or image gallery from the early days of Tumblr or Flickr that used this specific tagging convention. The Legacy of the Search
The "horsecore 2008 2 6 link" represents the ephemeral nature of the internet. It reminds us that despite the "the internet is forever" mantra, much of the early social web is actually incredibly fragile. Once a hosting service goes down or a forum admin forgets to pay the bill, entire subcultures can be reduced to a single, confusing search string.
The term "horsecore" likely functioned as a for a specific file archive. In an era where automated bots would scan for copyrighted material or "high-risk" content, users often gave files surreal or nonsensical names to avoid deletion. The Mystery of the "Link"
Here is an exploration of the context, the era, and the mystery behind this specific search string. The Anatomy of the Search: Breaking Down the String