Old Ball and Chain
Also The OB&C
One of a series of fond endearments for what Californians would refer to as the Life Partner or Significant Other.
Other terms may include...
The Memsahib (or Mem). An honourific for the wife of the master from the days of the Raj.
'Er Indoors. An ironic use of and old Cockney term for the Lady of the house.
Better Half. See above.
Her Ladyship. Requires no explanation.