Yes, boose, as in petted lip, but used in the context of "that wiz boosin'" = so obvious it was making faces. Written down I thought it might be mistaken for boozing, which is sometimes written down in these parts as boosing. Tricky thing slang.
4th Gen. They've got doags in Aberdeen. They also pronounce balls the same way kintyre people do, maybe that's a highland/lowland difference?
(not doing the jokes, that's too boosin')
General Jack. I think, just think, that Angus may have written it the way I did in one of his books. And I seem to remember he said it may have
come from the French "bouche" = mouth. If it was there could be a common connection between boosing and boozing?