A parting word, as in "Good-bye," or "Until we meet again." Hawaiian in origin, it was popularized by author and gonzo journalist Hunter S. Thompson, who used it frequently in his columns and diatribes. People mistakenly credit it to later sources, such as Adam Carolla, but these people are all fifteen.
Until next time, remember to trust in America and keep your middle finger pointed at George W. Bush. Mahalo.