"Master-BBB" is a combination of two terms in the context of adult content.
1) "Master": This term can have multiple meanings depending on the context, but generally refers to someone who is dominant or in control, often in the context of BDSM or power dynamics. In this case, it might suggest that the individual in question is experienced, skilled, or particularly adept at their activities.
2) "BBB": This term is likely an abbreviation for "Big Black Balls," which typically refers to a large black penis in the context of adult content. It's often used to describe interracial scenes where the male performer has a larger than average, or dark-skinned, erect penis.
So, the tag "Master-BBB" implies that the scene involves someone who is experienced and possibly dominant (a 'master') engaging in sexual activities involving a large, black penis (BBB). The content may involve BDSM, power dynamics, or simply a focus on interracial scenes where size and race are important factors.