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.
Muise; Indeed
(b) Muise! Muise!; Well, Well!
Muisiam; Upset.
Muisiamach; 1. Upset; perturbed; irritated.
2. Feeling sick.
3. Heavy / drowsy / dull.
(There is a "fada" over the "u" in each of the above.