The term "bear-fetish" in the context of a porn video tag refers to a specific type of fetish or preference that some individuals may have. In this case, the term "bear" is used as a slang term for a certain body type or physique typically associated with older, hairier, and more heavyset men.
A "bear-fetish" therefore implies a fondness or attraction towards individuals who possess these specific physical characteristics. The tag can be used by content creators to indicate that the video features actors or performers who fit this description, catering to viewers who share this particular preference or fetish.