So whoever created this file was watching a video on September 10, 2013, and at exactly 15 minutes and 58 seconds into the video, they pressed the screenshot button in VLC.

Thus, this keyword likely originated from a forum post, an old blog comment, or a metadata field (e.g., an EXIF comment, a text file in a torrent description) where someone tried to share or reference a specific frame from a video labeled or tagged "boys life."