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Meaning of yo

yo

Pronunciation: (yō), [key]
— interj.
  1. (used as an exclamation to get someone's attention, express excitement, greet someone, etc.)
  2. here; present: used esp. in answer to a roll call.

y.o.

Pronunciation: [key]
  1. year old; years old.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.