So, what does "dad son myvidster repack" actually mean?

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The keyword is a hyper-specific search term used in online communities, most likely to find compressed collections of adult videos on a niche social bookmarking site.

Once a repack is created, it is re-uploaded or linked back to social bookmarking sites using hyper-specific keyword strings. Descriptors like thematic identifiers, the platform name, and the word "repack" are appended to the title. This allows specific sub-communities to easily find and bypass standard algorithmic filtering.