Eeewwww... NOT "oi"!!! It's what you shout at a dog that's not obeying. I so effing hate that.
Maybe it works if a woman calls you cute, just say "Oi! I don't like that!"
There is a slight chance she'll punch your light out, but it's worth a shot, haha.

well I am defending a pet hate after all :)

n. British. informal. Used to attract someone's attention, especially in a rough or angry way. 'oi, don't lean out'

Pet hate ? :) It simply means Hi or Hello in other languages.

Oi? Reminds me of Only fools and horses

“Oi, oi lad, shut your pie hole and stop chirping... Oi, lad! It is over, over!”

"oi", How say you? We are not trying to be pedantic, are we?

Oi
— interj
1. (Brit )
Used as a greeting or to attract someone's attention

As in: google books: Dreams of the Soul https://books.google.co.id/books?id=pQRcAAAAQBAJ&lpg=PA431&dq=oi+lad&pg=PA431&redir_esc=y#v=onepage&q=oi%20lad&f=false

“Oi, oi lad, shut your pie hole and stop chirping... Oi, lad! It is over, over!”

— adj
2. of or relating to a form of punk rock popular esp among skinheads in the late 1970s and 1980s.

“Oi!” is a working class street-level subgenre of punk rock that originated in the United Kingdom in the late 1970s. The music and associated subculture had the goal of bringing together punks, skinheads and other non-aligned working class youths (sometimes called herberts).

https://en.wikipedia.org/wiki/Oi!