おい

おい
interjection
hey
1. hey, oi
An interjection used to get someone's attention or express surprise. Typically used by men and considered casual or rough.
おい、()てよ!
Hey, wait!
おい、大丈夫(だいじょうぶ)か?
Hey, are you okay?
おい、(なに)やってるんだ?
Hey, what are you doing?

Typically used by men. Can sound rough or demanding depending on tone. Not used in formal situations.

Can also express surprise or disbelief when said to oneself: おいおい (hey hey, come on).