What does the Scottish or Australian terms "haver" and "havering" mean?

According to The Free Dictionery it means “hem & haw or to babble”

I saw a similar definition but it doesn’t seem to go with the meaning of the song.
I figure it is some slang term known only to Aussies.

“In Scottish English, haver (from the Scots havers (oats)) means “to maunder; to talk foolishly; to chatter,” as heard in the song “I’m Gonna Be (500 Miles)” by The Proclaimers”

https://en.wikipedia.org/wiki/Havering_(disambiguation)

“Maunder”“_move or act in a dreamy or idle manner.”

https://www.google.com/search?client=firefox-b-1-e&q=maunder

To talk nonsense.

Haver is still used in everyday speech in Scotland. I don’t know about Australia.
According to the Scots Dialect Dictionary it means:

1. To talk at random
2. To talk incoherently, or nonsensically

As a noun it means nonsense or foolish talk or a piece of folly.

A haversack originally meant a bag of oats

I’m not an Aussie, but “to babble, etc.” kind of makes sense since in that same verse he’s singing about getting drunk.

Well, that meaning isn’t what I expected! But, I get it now.

Also:
“If I get drunk, well, I know I’m gonna be
I’m gonna be the man who gets drunk next to you”

Really? Is that a compliment to her? I’d expect her to throw his ass out until he sobers up. And promises to make up all the money he spent on booze!

According to this quote he should not be spending money getting drunk.
“I’m gonna be the man who’s workin’ hard for you
And when the money comes in for the work I do
I’ll pass almost every penny on to you.”

Speaking nonsense.