It looks like you're asking for content related to the terms — but this phrase is not associated with any known mainstream game, movie, music release, or internet event from 2008.
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, as a unique blend of thrash, death metal, and punk. The Houston-based band’s work is noted for its "horsecore" sound, which blends extreme metal with dark humor. Read the review at Cosmic Hearse November 2008 - Cosmic Hearse 30 Nov 2008 — horsecore 2008 2 6 link