Ah ... there we go. I thought it could be some kind of slang in another language. but even within a larger word? Seems like the filter is a bit too sensitive. But, it's also likely very hard to create a reliable filter for multiple languages using the same character set.
And, to be specific here ... this is a PS3 issue, not a GT5 issue. It happens on the standard PS3 chat as well.
It even **** some swiss german words but no offensive ones. It's very weird and you could think they spent more time censoring languages than doing useful changes to the game