Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: A natural form of greeting

yo

 interjection
     
yo informal especially American English
used to greet someone, to get their attention, or as a reply when someone says your name:
Yo, dude! How's it going?
'Darren?' 'Yo!'
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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