Barebackthathole Porn Videos
The term "barebackthathole" in the context of a porn video refers to a specific type of sex act. "Bareback" refers to having unprotected, or condom-less, penetrative sex, and "that hole" typically refers to one of three bodily orifices - vagina, anus, or mouth.
Given the context in which you presented this term, it is most likely referring to anal sex without a condom (bareback) between two men or a man and a woman. The term is used by adult audiences familiar with pornography to describe explicit content featuring these specific acts.