What does YY stand for?

MLA style: "YY." Acronym Finder . 2012. AcronymFinder.com 10 Feb. 2012 http://www.acronymfinder.com/Too-Wise-%3a_)-(YY).html
Chicago style: Acronym Finder . S.v. "YY." Retrieved February 10 2012 from http://www.acronymfinder.com/Too-Wise-%3a_)-(YY).html
APA style: YY. (n.d.) Acronym Finder. (2012). Retrieved February 10 2012 from http://www.acronymfinder.com/Too-Wise-%3a_)-(YY).html

Too Wise :-)

This definition appears very rarely and is found in the following Acronym Finder categories:

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Medicine Hat, Alberta, Canada - Medicine Hat Airport (Airport Code) Fort St John, British Columbia, Canada - Fort St John (Airport Code) Sioux Lookout, Ontario, Canada (Airport Code) Youth Extra Large (clothing sizing) Prince George, British Columbia, Canada - Prince George BC (Airport Code) Youth Extra Small (clothing size) Terrace, British Columbia, Canada - Terrace (Airport Code) London, Ontario, Canada - London Municipal (Airport Code) Whitehorse, Yukon Territory, Canada - Whitehorse Airport (Airport Code) Double Yellow (railway signalling)		Yami Yugi (Yu-Gi-Oh!) Yao Yao Year (format) Yes Yes Year/Month/Day Yin Yang-1 (Ribonucleic Acid Transcription Factor) You, You're Awesome (band) Youth and Young Adult ministries (Church of the Brethren ministry for youth and young adults) Youth and Young Adults Program (United Church of Christ Coalition for Lesbian, Gay, Bi, and Transexual Concerns; Cleveland, OH) Ystävyys-, Yhteistyö- ja Avunantosopimus (Finnish: Agreement of Friendship, Cooperation & Mutual Assistance Treaty Finland & USSR)