You can think of missus as the title Mrs written down exactly as it sounds in ordinary speech. Once a title is loose from any name, it can be used in two ways. You can throw it at a woman you do not know, the way you would say lady, and you have a way of calling out to her. Or you can use it about the woman of the house, and it becomes a casual name for a wife — the missus. Both uses stay close to the street: this is a word for talking, for fiction and for film, and it does not go into careful writing.
From the word’s history
The source says missus represents a common pronunciation of Mrs, which is itself a reduced form of Mistress. The capitalised spelling Missus is listed as eye dialect of Mrs.
來源資料說 missus 是 Mrs 常見唸法的寫法，而 Mrs 又是 Mistress 縮短而成。大寫的 Missus 被列為 Mrs 的方言拼法。
Wiktionary entries for missus and Missus, etymology_text supplied in this packet: "Representing a common pronunciation of Mrs, a reduced form of Mistress." and "Eye dialect of Mrs." (source_refs kaikki:3f6f69a190036ae4:819611506 and 945997869)
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