What does Taumatawhakatangihangak oauauotamateaturipukaka pikimaungahoronukupokaiwhe nuakitanatahu mean?

That's the name of a hill in New Zealand, and it's often cited as the longest place name in the world. However, it's not really a single word, but rather a combination of Maori words that translate to:

"The place where Tamatea, the man with the big knees, who slid, climbed and swallowed mountains, known as the land eater, played his nose flute to his loved one."

It's essentially a poetic description of the hill and its surrounding area, rather than a literal translation of the place name.