I've just remembered, when I taught in Glasgow many years ago, I had to learn the lingo, as the pupils were nearly unintelligible to my English ears. And I noticed they put the word 'but' at the end. So for example I'd say, "You haven't underlined the heading." And the child would reply, "Miss, I've lost my ruler but."
I wonder if this is the case in Ireland, because a lot of the Glasgow population had origins in Ireland, judging by the plethora of Irish surnames!