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often used as a gteeting in replacement of "hey yo"
a yo by danteslangindatslang July 3, 2006
Used by Koreans; mostly.
Short for: 'Annyeonghaseyo.' (안녕하세요) - Meaning 'Hello.'
Girl: Hello. "(안녕하세요)."
Boy: "A-Yo. (라-요)"
A-Yo by iSpankasmurf April 24, 2011
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.
A Yo by muthangya April 17, 2009
An insulting term for a black youth; often used as shorthand for black criminals along with "toad".
F**king a Yo is running ragged across this neighborhood...
source:
http://en.wikipedia.org/wiki/Homicide:_A_Year_on_the_Killing_Streets#The_slang
a Yo by GPS..... January 12, 2009

A yo wowday 

A term used to call out a black whore to soliscit them for sex or other dirty things
I saw Shawna walking home from the club and I was horny so i yelled out a yo wowday..
A yo wowday by Redrum61 January 2, 2010

a yo baby sup tryna fuh 

to ask to have sexual relations with the oppisite sex
origin- Ocean City 2007
translation
"Hello person/persons of the oppisite sex, would you like to have sexual relations with me?"
drive by a group of people slowly and yell out the window at them "a yo baby sup tryna fuh"

also can be used as a great line to get women, whisper in her ear "a yo baby sup tryna fuh"