Derogatory term for a gay porn star. It possibly came from subtle unwitty jokes, originally spoken by Beavis in Beavis and Butthead.
Example: Ron Jeremy has had sex or dominated hairy bushes, the hair around the genitalia, of both sexes.
It can be used indirectly or politically for instance:
George Bush has had butt-sex with Osama Bin Laden eg promoting him into becoming bushmaster.
Monica Lewinski has ravaged her bush by Bill Clinton in the presidential office by enforcing executive decision over master of the bush.
Any person (male or female) who is skillfully adept at having sex with a woman.
John: "Rick has had sex with like ten women in the last year."
Steve: "Ten? Are you kidding me."
John: "Nope. The guy is a total bush master from what I've heard."
a man who has sex with women who have a large quantity of genital hair.
yeah....that guys a total bushmaster