they are geordies, they come from the city of newcastle and they are singing in geordie.
'The dialect of Newcastle is known as Geordie, and contains a large amount of vocabulary and distinctive word pronunciations not used in other parts of England. The Geordie dialect has much of its origins in the language spoken by Anglo-Saxon mercenaries, who were employed by the Ancient British people to fight Pictish invaders, following the withdrawal of the Romans from Britain in the 4th century. This language was the forerunner of Modern English; but while the dialects of other English regions have been heavily altered by the influences of other foreign languages—particularly Latin and Norman–French—the Geordie dialect retains many elements of the old language'
we used to play a game in york only 72 miles from newcastle, are they geordie or are they dutch. the rule was, if they spoke english they were dutch.