: This is likely the username or handle of the content creator or the person who uploaded/archived the file. There is a profile for 4horlover on Last.fm which suggests they may be involved in music or media sharing.
: IDs like "KOC" are sometimes associated with specific production labels or cataloging systems for independent video creators. 4horlover___KOC387.mp4
: It is common for users to archive videos from platforms like TikTok, Instagram, or Twitter using bots that generate filenames combining the uploader's name and a serial ID. : This is likely the username or handle