Ain't

The word ain't is a contraction of "is not", "have not", "are not" and "has not" in English vernacular.
The development for "ain't" happened independently and at different times. The usage of "ain't" for the forms of "to be not" was established during the 18th century, and "to have not" by the early 19th century.
The using of "ain't" is a major subject of controversy English. The word is used by many speakers in oral and informal settings. But its use is often with stigma.
"Ain't" is found all across the English-speaking world in many regions and classes. The word is of a nonstandard nature. 
"Ain't" is used all over the United Kingdom. Its geographical distribution has increased over time. It is also found all over the United States, including in the South, New England, the Mid-Atlantic States, the Appalachia and the Upper Midwest. But "ain't" can also be used in the Great Plains and other Midwestern States.
In England, "ain't" is generally considered to be a nonstandard or illiterate usage. That's because it is used by people of a lower socio-economic class and by educated people with an informal manner.
"Ain't" is also used in Australia and New Zealand.