It may refer to a niche video or "leak" shared within a specific online community or "gang" (often used colloquially for a group of friends or a fan base) that has not reached mainstream recognition.
Based on the file naming convention ( .mp4 ) and the phrasing, this term appears to be associated with: Gang Msty Uncutmp4
If you have more context—such as the where you saw it or a specific creator it might be linked to—I can try to dig deeper for you. It may refer to a niche video or