dart accent, n. — Green’s Dictionary of Slang

dart accent n.

also dortspeak, Roadwatch accent

[DART, Dublin Area Rapid Transit, i.e. those areas served by the system. The accent was orig. identified among radio/TV presenters (thus the ref. to the programme Roadwatch) and is typified by the use of the phoneme ‘ou’ in such words as ‘cow’]

(Irish) an affectedly quasi-British accent, adopted by the middle class in and around Dublin.

1996		Donovan & Kennelly Dublines 42: The teacher said that the pupils of Dublin’s southside all-Irish schools speak Irish in this ‘Roadwatch’ accent, too. Or call it a DART accent.
2000		‘Would You Believe’ section of Rte.ie 🌐 Episode 20 8 Feb. In that work few people are indifferent to his accent. He is touchy about it, he says it is not a Dublin accent (which he defines as a Dart accent) it’s a working class Dublin accent.
2001		Sun. Business Post 23 Sept. 🌐 The southside girlie boasts a ‘Dart’ accent, though I suspect she has never set foot on one. The secret with the accent is to purse your lips like you are about to kiss. Then start speaking. Instant posh accent, just add brains.
2005		R. Hickey Dublin Eng. 47: Why ‘Dortspeak’ failed The new accent of the ‘Dublin 4’ set quickly became noticed and the object of satirical comment.