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 "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. Gang Msty Uncutmp4
It is possible the term is a misspelling of a different trending topic or creator name. If you have more context—such as the where