I checked www.mingmung.com (it was on the video) and it mentions that the names on that video are now a hot property, ha.
Makes you wonder: did they do the video for a goof, and then reg the names later as they saw it catching on, or was the whole thing a clever experiment: make a funny youtube video that's certain to get a lot of views, and feature some domain names you make up, and see if they get any traffic, become word-of-mouth terms, etc, and become valuable...