yo

yo

[yoh]
interjection
1.
(used as an exclamation to get someone's attention, express excitement, greet someone, etc.)
2.
here; present: used especially in answer to a roll call.

Origin:
1375–1425; late Middle English

Dictionary.com Unabridged

y.o.

year old; years old.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
yo (jəʊ)
 
sentence substitute
an expression used as a greeting, to attract someone's attention, etc
 
[C20: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

yo
as a greeting, 1859, but the word is attested as a sailor's or huntsman's utterance since c.1420. Modern popularity dates from World War II (when, it is said, it was a common response at roll calls) and seems to have been most intense in Philadelphia.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
yo
  1. Yoruba

  2. year-old

YO
years old
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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