Emmet (Cornish)
Emmet (alt. spellings emmit, emit) is a word in the Cornish dialect of English that is used to refer to tourists or holidaymakers coming to Cornwall. There is debate over whether the term is pejorative or not. It originally referred to tourists who visit Cornwall, but has also been used by native Cornish folk to refer to "incomers" or residents who have moved to the county but were not born there. Etymology
It is commonly thought to be derived from the Cornish-language word for ant, being an analogy to the way in which both tourists and ants are often red in colour and appear to mill around. However the use of 'emmet' to mean ants is actually from the Cornish dialect of English, and is derived from the Old English word æmete from which the modern English word ant is also derived (compare Modern German Ameise [ant]). The Cornish word for ants is actually moryon (singulative moryonen)

Porthemmet Beach hoax
Porthemmet is a fictitious beach that supposedly can only be accessed via a cave found between Harlyn and St Merryn. It has been rumoured to have existed since the 1990s, but is considered a hoax as many tourists try to locate it, but cannot. In August 2007, Truro-born Jonty Haywood began promoting a fictional Porthemmet (Port of Emmet) beach in North Cornwall with fake road signs and a hoax website, which directed people to random areas on the north coast, confusing tourists and amusing locals. In July 2008, Haywood placed a further set of signs. 2021 graffiti 
In August 2021 a number of incidents were reported in which the word 'emmet' was used pejoratively in graffiti across Cornwall. At Pedn Vounder beach the phrase 'Emmets go home' was spray-painted onto rocks, whilst 'Die emmets' appeared on the welcome sign to the town of Hayle. See also

 Grockle is a similar West Country dialect word used in Devon but emmet is distinctly Cornish. Cornish self-government movement
 Constitutional status of Cornwall
 Politics of Cornwall
 Mebyon Kernow

References

Cornish culture
Cornish nationalism
Pejorative terms for in-group non-members