Crazy girl battle cry — translation.

[Monger D. Luffy]

There is this girl that each time she see me come running screaming “man kiiaaoo man kiiaaoo” and begin to hit me (slowly) and ticklish me.

I don’t know how to write it but sound like Man kiiaaoo. Still clueless what it means but it’s fun to see her goes berserk. 

[Harry Brown]

It kind of means you are cheeky in a cute way.

[Ohyesuare]

Usually means they want to bite, pinch, hurt you, in a playful and friendly way. 

[maxtroy]

Means  " You are so cute I could just eat you up" 

Sounds more like man keoww.