Bonus: In the context of porn videos, a "bonus" often refers to additional content or scenes that are included as an extra for viewers. This may include alternative versions of the main video, behind-the-scenes footage, or additional scenes with different performers.
Hole: A slang term for the vagina in pornography. It is sometimes used interchangeably with other terms like "pussy," "box," or "cunt."
Boys: This refers to male performers or actors involved in the video.
So, "bonus-hole-boys" likely means a bonus scene featuring male performers engaging in sexual activities involving a vagina.