HutYaw video

Woohoo! I think I figured it out!
This is an older clip, but it's a beauty. Inspired by the traditional Maori war dance performed by the All Blacks rugby team (New Zealand's national team), David and Conbo came up with their own rendition of the "rugby dance".
Just like Donny & Marie are "... a little bit country and a little bit rock and roll," David & Connor are a little bit Maori warrior, a little bit Broadway showtune.