What is that「かオイ」sentence ending?


I found few instances of「プール行くかオイ」in the manga I'm reading like this one
below.

[![q](https://i.stack.imgur.com/HeKM4.png)](https://i.stack.imgur.com/HeKM4.png)

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?




It is only the ending
[か](https://www.kokugobunpou.com/%E5%8A%A9%E8%A9%9E/%E4%B8%BB%E3%81%AA%E7%B5%82%E5%8A%A9%E8%A9%9E%E3%81%AE%E7%94%A8%E6%B3%95/#gsc.tab=0)
+ オイ ("Hey!"). With オイ, it sounds like the speaker demanding the listener's
attention/response.

This sounds rude, and in that sense, can be called a slang. Depending on
contexts, it can mean hostility.

Note that オイ is not a grammatical ending. It is just _Hey_. `プール行くかオイ : Are we
going to a pool, aren't we?` can be written `プール行くか、オイ` or `オイ、プール行くか`.

The fact that this is said by a woman or a girl is not that surprising. I
think that 'strong' girls often talk that way in manga, even though very few
girls (and possibly no women of decent age...) would do so in reality.

===

A particular phrase that comes to my mind is `やんのかオイ`, which means something
like _Are you gonna fight with me?_. This オイ can be replaced with コラ
(`やんのかコラ`). These are typically used by naughty boys (不良) in manga confronting
with each other.




It is only the ending
[か](https://www.kokugobunpou.com/%E5%8A%A9%E8%A9%9E/%E4%B8%BB%E3%81%AA%E7%B5%82%E5%8A%A9%E8%A9%9E%E3%81%AE%E7%94%A8%E6%B3%95/#gsc.tab=0)
+ オイ ("Hey!"). With オイ, it sounds like the speaker demanding the listener's
attention/response.

This sounds rude, and in that sense, can be called a slang. Depending on
contexts, it can mean hostility.

Note that オイ is not a grammatical ending. It is just _Hey_. `プール行くかオイ : Are we
going to a pool, aren't we?` can be written `プール行くか、オイ` or `オイ、プール行くか`.

The fact that this is said by a woman or a girl is not that surprising. I
think that 'strong' girls often talk that way in manga, even though very few
girls (and possibly no women of decent age...) would do so in reality.

===

A particular phrase that comes to my mind is `やんのかオイ`, which means something
like _Are you gonna fight with me?_. This オイ can be replaced with コラ
(`やんのかコラ`). These are typically used by naughty boys (不良) in manga confronting
with each other.

