Saw this on a car bumper

I have seen a car around with some hanzi on its bumper and today I saw it long enough to write it down.

無畏賤人

 Putting this in MDBG gave me a meaning I'm not sure of so I wonder if it may be Japanese  rather than Chinese  (the car was a Subaru).  Can anyone shed any light. 

 Oh and for those that look it up in mdbg the driver was male ;-)