Oi Definition

oi
interjection
Used as a greeting or to attract someone's attention.
American Heritage
Webster's New World
Oi, an alternative spelling for oy or oy vay, is defined as a Yiddish expression used to express frustration, pain or worry.
An example of oi used as an interjection is in the following sentences: "Oi! I forgot my wallet at home!" which means "Oh no! I forgot my wallet at home!"
YourDictionary
pronoun

(south west England) Eye dialect spelling of I.

Wiktionary
suffix
Plural form of -os.
Wiktionary
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Origin of Oi

  • From the Ancient Greek -οι (-oi), the second-declension masculine nominative plural case ending — the plural form of -ος (-os); compare the equivalents of the Latin second declension (-us), with which the Grecian case endings are usually substituted in English words, especially in the plural.

    From Wiktionary