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3. shain't
Abbreviated form of "shit ain't".
My Boss wants me to work the weekend. That shain't happenin.
1. shain't
Replacement for should not or shall not to drive a pedant who is easily offended by ain't absolutely batshit crazy.
Nerd: "ain't" is not a word in the English language.
Dude: Well, I guess we shain't use that one no more then.

Exec: We need this done in 10 business days.
Staff: Well, I guess you better stop tossing the salad and approve the project then, shain't cha?
2. Shain't
the combination of the word she and ain't , so you don't have to say the two words seperate
Shain't gonna come to the party later on
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