Interjection (kandoushi)
hey!; wait a minute!; whoa!
see おい
おいおい、一枚看板のお前が来れないんじゃ、今日の合コン盛り上がらないよ。We're counting on you to be the life of the party. It'll bomb if you don't come. Adverb (fukushi), Adverb taking the 'to' particle
boohoo; waaaa
Onomatopoeic or mimetic word
Also written オイオイ