I. noun
1.
a. : wife
my old lady … said when we were first hooked up it was usually the bills — Adela R. St. Johns
— not often in formal use
b. : mother
used to fight with my old lady about taking a bath once a week — L.M.Uris
— not often in formal use
2. : old maid 2
II. noun
: girl friend ; especially : one with whom a man cohabits