This name follows the standard format used by for video files: VID : Short for Video.
: A unique serial number assigned to that specific file on that day.
Because these files are private and stored locally on your device or in your personal cloud backups, I don't have access to the actual video content. It could be anything from a family holiday greeting to a funny clip shared in a group chat back in 2015.
Are you trying to this specific video from an old backup, or were you looking for a description of a viral video that might have been circulating under that name?
: The date the video was saved or sent (December 7, 2015). WA : Indicates the file originated from WhatsApp.
