Hey now, it's not Bielefeld. In Ohio at least, the word it's concealing is taboo enough that nobody who does know wants to explain to their more-sheltered coworkers why the situation is funny. (Clearly the filter wasn't designed in Australia.)
The Register has lots of readers outside the UK, and it has never shied from -- on the contrary, seems it positively delights in -- blowing this stuff up in its pages.
I'm also in the UK, so I don't really know. I thought/assumed it was fairly well-known among software engineers, HN, etc. (not discounting the day's 'lucky 10,000' of course) but not so much by others, regardless of country. :shrug: