Pitmatic (originally "pitmatical"), also colloquially known as "yakka", is a dialect of English used in the counties of Northumberland and Durham in England. It developed as a separate dialect from Northumbrian and Geordie partly due to the specialised terms used by mineworkers in the local coal pits. For example, in Northumberland and Tyne and Wear the word Cuddy is an abbreviation of the name Cuthbert but in Durham Pitmatic cuddy denotes a horse, specifically a pit pony. In Lowland Scots, cuddie usually refers to a donkey or ass but may also denote a short, thick, strong horse.
Traditionally, pitmatic, together with some rural Northumbrian communities including Rothbury, used a guttural R. This is now less frequently heard; since the closure of the area's deep mines, many younger people speak in local ways that do not usually include this characteristic. The guttural r sound can, however, still sometimes be detected, especially amongst elderly populations in more rural areas.
While in theory pitmatic was spoken throughout the Great Northern Coalfield, from Ashington in Northumberland to Fishburn in County Durham, early references apply specifically to its use by miners especially from the Durham district (1873) and to its use in County Durham (1930).
Dialect words in Northumberland and Tyneside, including many specific to the coal-mining industry, were collected in the two volumes of Northumberland Words by Oliver Heslop in 1892 and 1894.
Although he did not use the term, Alexander J Ellis's work on the language of miners "between rivers Tyne and Wansbeck" has been studied as an early transcription of Pitmatic, which used informants from Earsdon and Backworth. In the 1950s, the Survey of English Dialects included Earsdon as a site and many of the forms recorded matched the transcriptions in Ellis's early work, although some appeared to have modified under pressure from other forms of English.