There are hundreds of Indian languages in North America alone, and your question sounds like "How do you say hello in the European language"?
Having said that, I think you're looking for hóka-héy, today is a good day to die, in Lakota. Bear in mind you don't just mumble this; you belt it out like it's the last thing you will ever say on this earth, and you have already made your peace.
** What you are looking for is the Lakota language, and the phrase is the one attributed to Crazy Horse, the Sioux chief at the battle of Little Big Horn. Hoka hey is simply an exclamation to draw attention, similar to a coach saying, "lets do it!" In all probability Crazy Horse never said, "Today is a good day to die," that is the English bastardization of a common Sioux battle-cry of, "Nake nula wauŋ welo!" This phrase really means, "I am ready for whatever comes (somewhat paraphrased by me)." It was meant to show the warriors were not afraid of the battle or dying in it. So... Crazy Horse probably shouted, "Hokahey! Nake nula wauŋ welo!" and then went on to kick the cavalry's butt.**
Líla pilámayapelo kolá, great answer and much-needed clarification :) (and kick some Cavalry butt Crazy Horse did, and in style!)
Loco - Apache - died in 1905.
every day
Today is never a good day to die. There is never a good day to die and everyone dies when their time comes.
Apache Bull Ramos died on 2006-05-27.
A Good Day for Love to Die was created in 2010.
A Good Day to Die was created on 2007-12-29.
A Good Day to Die Hard was released on 02/14/2013.
The Production Budget for A Good Day to Die Hard was $92,000,000.
Apache - Viet Cong soldier - died on 1966-11-13.
Lack of food and resources
A Good Day to Die Hard grossed $67,349,198 in the domestic market.
it means that the dead language Latin is now dead