Chad's Gap was first referenced in Episode 6 of BBLiveShow. Someone named "Timbo" called in and asked Brian and Mike how to get to Chad's Gap from the bottom of Alta. He also claimed to have a friend, Tanner, who "hit it" and broke his ankles.
It was one of the show's first "WTF!?" moments.
The call starts at 41 minutes into the recording of Episode 6.
Location of Chad's Gap
Chad's Gap is apparently a location in Utah. Although it is not an established ski area, it seems to be a fairly legendary place for extreme skiing. It is located just north of Alta.
Visit to Chad's Gap
In connection with Nerdtacular '13 a visit to Chad's Gap was proposed as the event was only a couple of miles away, but then someone started passing around the Ruinum and everyone kind of forgot about it.