Balgownie is home to Wollongong's rudest Twitter users, but our neighbours over the escarpment really need to wash out their mouths with soap.
After surveying more than four million Twitter posts between June 2013 and March 2014, Melbourne mapping consultant Simon Jackson has assembled an Australia-wide map of the suburbs that swear most online.
Cross-referencing location-sharing tweets against a list of more than 1000 swear words - from the "C word" to "WTF" - Mr Jackson, of geographical information systems firm Esri, discovered that the most profane tweeters in Australia were to be found on the western fringes of the Illawarra.
Technically, they are in an area dubbed the Illawarra Catchment Reserve, a massive inland area stretching from near Calderwood in the south to near Scarborough in the north, encompassing Cataract and Avon and stretching towards Appin and Colo Vale.
In the survey period, only 704 tweets were sent from that area. But according to Mr Jackson's data, 245 of them included rude words, with "a wide range of profanity being used".
This adds up to 34 per cent of tweets being rude, making it far and away the rudest area in Australia.
However, the majority of those tweets appear to have come from areas around Bulli Tops and the top of Mount Ousley, suggesting motorists - or more likely their passengers - on the F6.
"If someone is tweeting and is sharing their location, you can 'listen' and use mapping co-ordinates to plot their posts on a map," Mr Jackson said.
"We used our technology to listen to everyone tweeting and filter it down to the rude words."
As to which swear word was the most widely used, there were no surprises: it begins with the letter F.
Although the F6 along the escarpment may be the rudest hot spot in Australia, Illawarra residents were less offensive when tweeting from the Illawarra itself.
Among local suburbs, Balgownie was rudest (2.8 per cent of tweets). The next rudest was Wollongong (1.7 per cent).
But both were below the NSW average of 3.17 per cent.
Among the states, South Australia was the rudest, with 3.6 per cent, followed by Queensland (3.18 per cent), just ahead of NSW in third place.
The cleanest-tweeting state was Tasmania, with only 2 per cent.
Mr Jackson referenced tweets against a list of 1000 offensive phrases and words.
"Australians are very good at coming up with their own profanities," he laughed.
"We checked all the classics, the C word and the F word and D word and their various variations."
While the Twitter survey shows the region contains the rudest people in the country, it also includes the happiest place in the country, if you believe social media.
In February, Wollongong was named Australia's happiest city, in a similar experiment by travel guide Jetpac.
After processing 100 million Instagram photos, Jetpac found photos from Wollongong residents were the happiest and most smile-filled of anywhere in the country.