oi

Short definition from Wiktionary

Interjection

1. 1
   Said to get someone's attention; hey.
2. 2
   An expression of surprise.
3. 3
   An informal greeting, similar to hi.
4. 4
   Alternative spelling of oy.
5. 5
   Alternative spelling of oy.

Noun

1. 1
   A working-class punk rock subgenre of the 1970s, sometimes associated with racism.
2. 2
   Initialism of opportunistic infection.
3. 3
   Initialism of osteogenesis imperfecta.
4. 4
   Abbreviation of object of interest.

Pronoun

1. 1
   I.
2. 2
   Pronunciation spelling of I.