"Tranny-cumming" refers to a scene in a transgender adult film where the transgender performer reaches sexual climax or ejaculation. The term is a combination of "tranny," which is a slang term for transgender, and "cumming," referring to the act of coming or ejaculating during sexual activity. This tag indicates that viewers can expect to see a transgender performer reaching orgasm in this particular video.
Note: The use of this term and other similar terms may be considered offensive by some individuals. It is always important to respect the feelings, identities, and preferences of all people involved.