A less-noticeable, thick patch of embarassing hair on a person's body. People like this go to great lengths to hide their nasty hair during sexual encounters (i.e. having sex in the dark).
Duder 1: "Oh yeah dude I LOVE 69, but I can't do it with the lights on."
Duder 2: "Why the hell not?"
Duder 1: "Because my girl saw my hairy ass last time and said it was nasty. So, I gotta make sure the lights are off so it's incognito bush son!"
Duder 2: "Ha Ha dude! That's so sad that you have to hide that thing!"