Many English speaking countries, I'm sure the US is more the exception than the rule in this case.

Of course, 'git' is also an insult.

Git is a fairly mild insult though, roughly equivalent to calling someone annoying. I'm sure at least a few of us have thought Git (the tool) to be aptly named, from time to time.

And here I thought it was redneck for "get" like that's where ya git yer code from.

Linus once quipped "I'm an egotistical bastard, and I name all my projects after myself. First 'Linux', now 'git'."

Is "fanny" an insult at all?

Yes, in Britain it is, you fanny.

Damn! That was fannier than I expected. Lmao.

That one is specifically British though. Or perhaps even just English, I can't imagine a Scottish person using it.

So what? The answer to the question is still yes.

It was also equivalent to "bro" in the late 90s, at least in some circles in the US.

35+ years ago, my friend insisted it meant the UK definition and, until now, every time I heard the word, I'd think of the time my, otherwise smarty-pants, friend didn't know what the most basic, least offensive, slang meant.

It's pretty mild, but still offensive in the UK. Your friend was right to believe that much. That everyone thinks it means that? No - the US uses it differently for a region of the body slightly less offensive. It's a bit like spunk, which is also fairly offensive in the UK, and fag, which despite having an offensive meaning in the US, is actually traditionally not offensive here, though the US meaning is known and sometimes used - it means "cigarette" here mostly, and "faggot" means something less offensive too (a bunch of sticks or a type of meatball like dish.)

Remember when fanny packs were a thing?

Did you mean a bum bag?

But people wore them on their front side didn't they? I don't remember people turning them around and preparing them on their butts

No, we didn't call them that. Bum bag was the name. Bum being about as profane as fanny in the US, and probably the same thing.

More like “only in the US it isn’t” :)

Might be regional but fanny is definitely slang in the US as well, but very quaint/dated, meaning butt. Would generally be used in some sort of context like a grandma telling a kid, 'Get your fanny over here right this second!'

It would never be offensive or used with sexual connotation. It's kind of like the equivalent of wiener.

It was a popular name in France in the 90s ¯\_(ツ)_/¯

Yeah, Fanni is still used in Hungary.