A black bison is a sexual act in which a male has anal sex with a female, while the female simultaneously shits on his dick. Then as the male prepares to ejaculate the woman deepthroats his penis, swallowing both the male's semen and her own feces.

A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.

stage after blue waffle, it is so hairy and black that it looks like the head of a bison