There are 2 definitions of yo in English:

yo1

Syllabification: yo

exclamation

informal
Used to greet someone, attract their attention, or express excitement.

Origin

natural exclamation: first recorded in late Middle English.

Definition of yo in:

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Word of the day ween
Pronunciation: wēn
verb
be of the opinion; think or suppose

There are 2 definitions of yo in English:

yo2

Syllabification: yo

pronoun

Nonstandard spelling of you, used to represent black English.

adjective

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nonstandard spelling of your, used to represent black English.

Definition of yo in: