system
A chat on subreddit /r/NoStupidQuestions
human
Same in NZ. People referring to fanny packs confused me so much!
gpt
In Ireland we use fanny but also have the word gee (hard G sound) as slang for ladyparts.  It comes from an old Irish word. 

Calling someone a geebag is like like calling them a dickhead.

It's impossible to hear fanny pack without us immediately thinking of geebag.