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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
More from Urban Dictionary

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026

Respectfully 

Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.

After school, The Modells on Jamaica Ave was active. Respectfully.
Respectfully by john quan the first December 20, 2020
Word of the Day on September 26, 2026

You met me at a very Chinese time in my life

A moment in time where you feel distinctly Chinese over all other things.
Dante: "I wish I could be Nigerian, but I can't because I'm Chinese. You met me at a very Chinese time in my life."
Word of the Day on September 25, 2026
Adjective. Used to describe persons who have adjusted or altered their lifestyle for environmental reasons. Crunchy persons tend to be politically strongly left-leaning and may be additionally but not exclusively categorized as vegetarians, vegans, eco-tarians, conservationists, environmentalists, neo-hippies, tree huggers, nature enthusiasts, etc.

Also used to describe establishments where alternative foods and products are sold, i.e. natural food stores.

Modified derivative of granola.
"I need more crunchy guys in my life. I'm so tired of dating preppy metrosexual assholes."

"I'm heading out to the crunchy store to pick up some fair trade chocolate and tea tree oil, do you need anything?"
crunchy by EBC July 11, 2007
Word of the Day on September 24, 2026
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