Jack seems to have closed the previous thread, but I want to reply to Eddy, so I'm opening up another one.
*According to the Urban Dictionary
The word Vato is Spanish for "dude", or "man" - made popular by the song appropriately named "Vato" by Snoop Dogg...*
Baloney! The word vato was certainly not made popular by Snoop. It has been in use since at least the 1950's, and anyone who is even remotely familiar with Hispanic culture in the US, and especially the West Coast, has known this word for years. Cheech Marin of Cheech and Chong fame used to use the word all the time back in the 70's, and it appears in movies and TV shows frequently.