Pikey

Pikey is a slang term, which may be pejorative when so intended, used mainly in England, Scotland, Ireland, and Wales to refer to people who are of the Traveller Community, a lower-class person, regarded as coarse or disreputable.

The word piker is sometimes used in the United States, but a piker in Australia and New Zealand is someone who refuses to do something within a group. It is not well received among Irish Travellers or Romas, as it is considered an ethnic slur.