Homonym: Oi! (Greeting)
"Oi!" is a casual greeting commonly used in the United Kingdom, particularly in urban areas. It is often used to get someone's attention or to express surprise. The term can be friendly or confrontational, depending on the context and tone in which it is used.
The expression has roots in working-class culture and is associated with British English. It gained popularity in the 20th century, especially within punk music and subcultures. Today, "Oi!" is recognized internationally, often representing a sense of camaraderie or rebellion.