Definition of oi in US English:

oi

(also oy)

exclamation

British
informal
  • Used to attract someone's attention, especially in a rough or angry way.

    ‘oi, don't lean out’

noun

  • A type of harsh, aggressive punk music originally popular in the late 1970s and early 1980s.

Origin

Variant of hoy: first recorded in the 1930s.

Pronunciation

oi

/oi/