"That tribal dance they do before rugby games in New Zeland" was the best I could surmise about haka, but I wasn't far off.
So what is Haka? From the tome of human knowledge, Wikipedia:
A haka (plural is the same as singular: haka) is a traditional ancestral war cry, dance or challenge from the Māori people of New Zealand. It is a posture dance performed by a group, with vigorous movements and stamping of the feet with rhythmically shouted accompaniment. The New Zealand rugby team's practice of performing a haka before their matches has made the dance more widely known around the world.
New Zealand's All-Blacks rugby team, are probably the most famous for it:
No disrespect to Urban Meyer and Mickey Marotti, but hell, that's a lot more intimidating than Quick Cals.