Definitions by GPS.....

a Yo

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