I found few instances of「プール行くかオイ」in the manga I'm reading like this one below.
It seems to means「プール行こう」but I don't understand the purpose of「かオイ」sentence ending. I thought at first that this オイ is an injection meaning "hey" but I don't think it makes sense in this context. The speaker of this phrase is a woman and it's weird to me that it is placed at the end of the sentence, not the beginning.
Is「かオイ」some kind of slang?