What does YO stand for?

MLA style: "YO." Acronym Finder . 2012. AcronymFinder.com 10 Feb. 2012 http://www.acronymfinder.com/Year-Old-(YO).html
Chicago style: Acronym Finder . S.v. "YO." Retrieved February 10 2012 from http://www.acronymfinder.com/Year-Old-(YO).html
APA style: YO. (n.d.) Acronym Finder. (2012). Retrieved February 10 2012 from http://www.acronymfinder.com/Year-Old-(YO).html

Year Old

This definition appears very rarely

Other Resources:

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Yukon and Northwest Territories (Canada) Younger Next Year York and North Yorkshire Business Environmental Forum (UK) York and North Yorkshire Chamber of Commerce (UK) York and North Yorkshire Community Foundation (UK) Yachting New Zealand (Auckland, New Zealand) Young New Zealanders' Challenge (Lower Hutt, New Zealand) Fuel Oil Barge (Self-Propelled) Yarn Over (knitting) Yeah, Okay		Yearly Output Years Old Yoko Ono York (postcode, United Kingdom) Young Offender (Ontario) Young Ones (Naturistische Activiteiten Vereniging) Youthful Offender Yugoslavia Lockheed Q-Star single engine observation aircraft/sail plane Yield from Oxygen

Samples in periodicals archive:

18 BOBBY is one year old and from Altrincham, Cheshire, where lives with his 21-year-old mum Sarah who has part-time job working as a receptionist.

Two and three year old colt, filly or gelding 1 A Mitchell, 2 L Collett, 3 L Fitzgerald.

Gaza City's 15 year old Ibrahim Bassam Qaddura died of wounds sustained in an attack.