interjection
Used to call out to someone, express surprise, or ask someone to stop or wait. Often repeated for emphasis.
See also: おい
おいおい、ちょっと待ってくれよ。
Hey, wait a minute.
おいおい、そんなこと
Whoa, don't say that.
adverb, adverb taking the 'to' particle
boohoo; waaaa
Mimetic word for crying or wailing, often used with と or as an adverb describing the sound of sobbing.
赤ちゃんがおいおいと泣いている。
The baby is crying boohoo.