I remember way back when I was attending primary school (late 1940s) we used to say "There ain't such a word as ain't". If we used the word ain't, our teachers or parents would correct us as we should have used some other words, for example, is not, isn't, aren't or aren't. If memory serves me correctly, we would probably have found usage of "ain't" in movies and probably used by cowboys or gangsters. The other place that it may have been encountered back then might have been in comic books. The following examples might explain how "ain't" might have been used. There isn't such a word as "ain't" There ain't such a word as "ain't" I am not going to the picnic I ain't going to the picnic Isn't she good looking? Ain't she good looking? He isn't going anywhere He ain't going anywhere They aren't going to the party They ain't going to the party By common usage and acceptance, many words which were considered incorrect or a corruption of "proper" English, may in time, find their way, into the language.

Both jasmine and Stan offer good explanations and examples to answer this question, but just to make it perfectly clear: "Ain't" is not a word because it's not a contraction of two words, it's just slang. An example of contraction: I'm, you're, he's, it's, isn't, won't, weren't, can't, etc. It brings two words together in an abbreviation. So, "ai(n)" does not exist, even though the -'t for "not" does, & that's why it's slang and improper English.

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AIN'T: 1 : am not : are not : is not 2 : have not : has not 3 : do not : does not : did not http://www.merriam-webster.com/

aint is like saying isnt, or arent, or dont have... it basically means the word no example is : we aint going anywhere we arent going anywhere. example: we aint using good english we arent using good english example: i aint got any. i dont have any. it is basically a negative word.