1 definition by OldManJenkins9

Top Definition
The official greeting of the moon people, as defined by players of NASA's free online game Moonbase Alpha.

Commonly used a a greeting, proclamation of joy, or exclamation.

Pronounced "aye-yoo".
Astronaut 1: "aeiou?"
Astronaut 2: "AEIOU"
by OldManJenkins9 November 20, 2011

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