"bbw-gamer" is a porn video tag that refers to a specific type of adult content.
"bbw" stands for "big beautiful woman", which means the adult performer(s) in the video are larger or curvier than average and are considered attractive because of their size and shape. This is a fetish category within the porn industry.
The term "gamer" indicates that the content of the video involves the theme of gaming, either through the setting, costumes, or activities portrayed. This can include various types of games, such as console games, computer games, role-playing games, and more. It is likely that the performers are dressed in cosplay outfits, or that the scene takes place in a game room or arcade setting.
So, "bbw-gamer" denotes a porn video featuring big beautiful women in gaming contexts, either as the main theme or as a roleplay element within the scene.