The Wiktionary says that it translates to - The hill where the great traveller (Chief) Tamatea with the bony knees, who slid and climbed mountains, played his flute to his beloved.

That's a nice name, it brings a smile to my face.

https://en.wiktionary.org/wiki/Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokai...