The is a fascinating artifact of the underground OS modding scene. It represents a time when users fought against Microsoft’s telemetry (minimal in 8.1) and activation walls. It promised a bloated, "everything included" paradise.
The keyword refers to a third-party, modified version of the Windows 8.1 operating system. These "Editions" are typically unofficial ISO files distributed via torrents or file-sharing sites that have been customized to include extra software, themes, and pre-applied cracks (pre-activation) to bypass Microsoft's licensing. The Context of Windows 8.1 (2014) Windows-8.1-Heavier-Edition-Pre-Activated-2014-X64