It means Hey You.
It is mainly used when addressing an individual in any given situation to get his or her attention.
Ayo! What time is it?
Ayo, Can I talk to you for a minute?
by E520 October 22, 2003
a streamlined fusion of the salutation "hey, yo" that goes over extremely well with the modern urban entrepreneur.
"ayo, slim, whatcha'll be on?"
by sinicalypse May 04, 2003
a response for a very suspect or homosexual comment.
Dude 1: That's a big bulge in your pants, what is it?

Dude 2: AYOOOOOOO!!!!!!!!!!!!!
by Sosa Ave July 13, 2008
often used as a gteeting in replacement of "hey yo"
A yo dawg, wus good?
by danteslangindatslang July 03, 2006
Used by Koreans; mostly.
Short for: 'Annyeonghaseyo.' (안녕하세요) - Meaning 'Hello.'
Girl: Hello. "(안녕하세요)."
Boy: "A-Yo. (라-요)"
by iSpankasmurf April 06, 2011
Bay Area Slang referring to money
Ayo for yayo (money for crack)
by UmmmIdk??? October 14, 2014
The uncommon abbreviation for someone who's first initial is A. and who's last name begins with the letters 'y' & 'o'.
Goofus: Man, I wish there was a way to quickly address all my friends who's first initial is 'a' and who's last name begins with 'y' & 'o'.

Gallant: Listen Foolio, that's totally possible; don't you know about the uncommon abbreviation for names that have a first initial 'a' and a last name that begins with the letters 'y' & 'o'?

Goofus: Playa, It seems like it's uncommon because that is not a common combination of letters for someone's name.

Gallant: Slow your roll, Hustla. You're the one who felt like you needed a word to address ALL your friends with names with that letter combination.

Goofus: I'm tired of this, just tell me what it is.

Gallant: It's 'A Yo', alright? Thanks for sucking the fun out of this, fun ruiner.
by muthangya April 17, 2009

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