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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"
aeiou by OldManJenkins9 November 20, 2011
The Vowels of the English alphabet and how did you not know this
A aeiou are the vowels of the alphabet
aeiou by incylix October 27, 2020
(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
aeiou by Sudomoodo November 24, 2011
Welcome to vowels

Ayeeeeeee
Eeeeeeee
I
Owe
U
;)
AEIOU: are the Vowels and Ayeeeeeee, Eeeeeeee, I, Owe, you is just a weird way of remembering it ;)

Dude 1: hey! What are the vowels again?
Dude 2: let me put it this way
Ayeeeeeee
Eeeeeeee
I
Owe
U
AEIOU by figiHoE April 20, 2019
An expression in Scotland (in Dundonian venacular) meaning “I ate it all”. Pronouced “ah eh it aw”. The only word in the English language without a consonant.
Whur’s the Arbroath Smokie?”

“There’s nane cos aeiou!”
Aeiou by 1BigEck January 15, 2023
1: the word to say when you have nothing else to say
2: a saying when you owe someone money
3: when your so excited you scream AEIOU (pronounced ay-oo)
4: something you type when your bored
Man 1: aeiou...
Man 2: aeiou $20
Man 3: OMG AEIOU!!!!
Man 4: (types aeiou to see what comes up on google)
aeiou by Camer Londerin January 20, 2018