A male homosexual. Refers to the homosexual practice of congregating in public parks and seeking other homosexuals to fellate/sodomise.
"You can't give blood sir. You're a bush rustler"
by Archibald Leach October 27, 2007
A gay/homosexual. Bush being refered to as the pubic region.
"Watch your backs, he's a bush rustler."
by Samwell May 14, 2005