I was the internet and found a list of "Scottish Insults". I did the natural thing and went onto #eoff and read them out via vocaroo. It turned into me swearing and Shauna laughing at me. If you wanna here two Scottish people mouthing off to one another this is a link you want to click.
NSFW Language, and Scottish People
It got me thinking though, what sort of insult are localised to your home town/country? Is there any insult that would not make sense when heard by an outsider, much like my list?