In your view, what is a bommy knocker?

https://lemmy.nz/post/275214

In your view, what is a bommy knocker? - Lemmy NZ

Only Google it after you answer please

This is a term I have heard many times (in NZ) but I can’t actually connect it with a physical thing…
The BIG marbles lol
I call 'em dangerous to bare feet!
Yup - same in Australia
Some kind of door knocker?
A sort of monster with a butt fixation.
It’s when one boob is much bigger than the other.
A typo by Stephen King
British schoolyard game
Sounds like gin and tea, served hot with a twist of lemon.
It’s a flail. Like a wooden stick with a chain and a solid metal ball on the end

Never heard it before. I googled it in incognito tab, just in case.

Looks like a mace.

An insult, a sex act, and/or a drink.
gibberish phrase from a children’s story i don’t know?