No, that’s not a NY/MA/RI mispronounciation of someone who breaks into your computer. It’s the dance (ritual?), lasting about a minute, performed before each game by New Zealand’s Rugby team, the All Blacks. It has its roots in a Maori dance tradition, battlefield and other.
There’s actually a movement to ban the Haka, for reasons that seem pretty lame. A reference this morning by a travelling BBC World Service reporter led me to discover one enjoyable aspect of a sport that otherwise strikes me (forgive me, rugby aficionados) as eighty minutes of unmitigated, pointless violence.