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3.
Noun; AYE-yoo; The feeling of physical curiousity which prompts at a first encounter - a precursor to an infatuation.
I had a sense of aeiou when first saw her strange yet alluring molehair.
by Kevin Chau, aka CptnQuiefus January 28, 2004
 
1.
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
 
2.
(pron. AY-oo)

1. The standard set of vowels in the Latin alphabet.

2. An uncommon way of saying "Hey, you"
1. The vowels in the alphabet are A, E, I ,O, U and sometimes Y.

2.

GreenX: hey tober
Tober34: aeiou
by Sudomoodo June 05, 2011