Wiktionary
n. (context Dublin slang pejorative offensive English) A rural person. p. 106, by Raymond Hickey. John Benjamins Publishing Company, 2005. ISBN: 90-272-4895-8.
Wikipedia
In Hiberno-English and Ulster-Scots dialects, culchie is a term sometimes used to describe a person from rural Ireland. It usually has a pejorative meaning, but since the late 20th century, the term has also been reclaimed by some who are proud of their rural origin. In Dublin it is often used to describe someone from outside the Dublin Region, including commuter towns such as Maynooth. Certain border towns such as Bray and Balbriggan are barely included within the "Dublin" category. In Belfast, Northern Ireland, the term is used to refer to persons from outside Belfast city, but not necessarily outside the Greater Belfast area.
Usage examples of "culchie".
Luckily enough though, I had the previous week purchased a Saab 9000 from a huckster culchie car dealer I had met in the car one Sunday night, so after a week of toing and froing between insurers, Dublin City Council and the NCTS, I was back on the road.
And that goes for that culchie whom I sense is in your immediate vicinity.
Gardai were bolloxes, big culchie bastards from the country with big thick heads inside big thick caps.
Because they were thick culchies, they thought people from Dublin were all stupid too.
Malone muttered something about the culchies looking for a chance to slag them, sending them back to Dublin in a hearse.
Not only have the culchies gone home to mammy with the washing, but thousands of city folk have decided to join them and get pissed in Galway or Kilkenny for a change.