Apparently it's a slur against people with neurodivergence or mental disabilities
Not that I have seen anyone use it for that purpose, but I still wouldn't use it since Andrew is a *proceeds to list every slur known to mankind*
As an autistic person (so one of the groups people use the r-slur aganst), I don't viewit as offensive whatsoever
Because I've never seen someone use the r-slur specifically against mentally disabled people