The Foundary was a factory in Waterford where everyone's grandfather used to work. It was located down by the kay river. They used to pronounce it in this way due to the peculiar gutteral r sound of the old Waterford accent.
Hard balls of fluff (and other matter) that gather on a hairy arse that are very difficult to remove. Usually used to describe an annoying person that hangs around and won't go away.
term of encouragement, usually when forced to drink something unpleasant. e.g. "but I hate vodka 'n' red bull, it makes me boke" , "ach, houl yer wheesht and horse it into ye"