Did you possibly mean one of these? vat, vats, veto
Examples
“When I was in high school class of '98, I remember most Avenues members being light-skinned Chicano types, none of which spoke an ounce of Spanish, save for Chicano slang like "vato" and "barrio.”
“It was the secret fantasy of every "vato" living in or out of the "pachucada" to put on the zoot suit and play the myth.”
“October 26th, 2009 at 7: 47 pm andale vato gazomaz”
Advanced English Grammar Lesson for ESL – Passive Voice « Esl Videos « Videos « Literacy News
“No, not with her blonde hair and blue eyes but George Lopez, look out vato!”
“Yet each time they include me in the conversation, they refer to me as vato or loco or ese, terms used among Mexican Americans or their acculturated counterparts up and down California, both North and Baja.”
“By now I hear the George Lopez imitators saying as they go back to their internet shopping, "Geez vato, why you cryin'?”
“And so you listen to the first vato that comes along and whispers sweet nothings in your ear.”
“Those who are actually “jumped in” to neighborhoods perform reconnaissance, stir things up, and often shame the males into fighting—“Are you going to let that vato just walk over there, across the street and NOT do anything about it?””
“The bad news: you know the twenty-year-old vato, calling from jail...”
“The hard vato with his gangster pose has morphed into a thoughtful, measured man, aware of gifts and talents previously obscured by the unreasonable demands of his gang life.”
Lists
These user-created lists contain the word ‘vato’.
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Contemporary character classes?
as a youth I, and some others, made a pen-and-paper RPG, based in contemporary crime and suspense fiction + nonfiction, set in America's blighted urban centers, anonymous slurbs, and godforsaken hi...
acrobat, actor, artist, anarchist, bagman, arsonist, yuppie, yakuza underling, yakuza oyabun, yakuza lieutenant, writer, white trash and 192 more...
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outcasts
Words that people on Twitter don't think are words.
I wrote a little script that runs every day. It searches the Twitter API for tweets containing the words, "is not a word". Each (non...unfollow, suppose-ably, qirl, darkskin, haz, stoints, uglyer, boringest, fustrating, linx, yolo, excapes and 22476 more...
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Twitter favorites
The new favourite words of people on Twitter.
A script searches Twitter for "X is my new favorite word" and adds it to this list.
See also:
unfathomably, glice, cuh, fab, ciggaty, doll, thuggin, oxymoronic, pineapple, succubutt, griming, cheeky and 2369 more... -
justin's Words
braii, boerewors, lekker, viva, pap, lipodystrophy, lacticacidosis, sharp, chakalaka, defaulter, eish, oof and 256 more...
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Extract (2009)
Words from 2009 'Extract' film.
humbucking, vato, sweatpants, settle down, forklift, dinkus, mill around, condo, chlorine, insulation, fiberglass, bartender and 38 more...
Tweets
Looking for tweets for vato.

myblankinfinity Etymology:
From Spanish vato, ultimately from Spanish chivato. Term is mostly used by people from northwest Mexico (Sinaloa, Sonora, Chihuahua, Baja California).
Noun: vato (plural vatos)
(Chicano, slang) Hispanic youth; guy; dude
http://en.wiktionary.org/wiki/vato Mar 10, 2013