When you bring home a chick for some ass, who is just way too ugly to let your roommates see what you are about to get into. You just fuck her in the Backyard instead of inside the house.
Ave: "Dude I got this chick the other night."
Zach: "Oh Yeah, I didnt see her come in?"
Ave: "Fuck NO!! I gave that chick 'The Backyarder'!!"
Zach: "Damn, she was that nasty huh?!?!"
Ave: "Yeah bro, yeah!"