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1.
slang contraction of is not, are not, am not, do not or does not.
He ain't lazy, he just ain't got nothing to do.
por superrockstar125 10 de Fevereiro de 2003
 
2.
<negative third person singular> Chiefly American Colloquial Contraction

A single word that is equivalent to other words such as:
1) Am not
2) Are not
3) Is not

==> Most likely originated in the Southern States of America as it flows easily with their accent but has now been used in many places around the world.
"I aint going."
"We aint going."
"He aint going."
por Stuart Fletcher 29 de Janeiro de 2005
 
3.
Contraction of am not and slang contraction for anything else.
I ain't gonna watch Joe Millionare 2 because it ain't good.
por Chase 11 de Novembro de 2003
 
4.
Is now in a dictionary
Teacher: Ain't is not in the dictionary

Student: It's on the urbandictionary!
por martytiptoes 20 de Outubro de 2010
 
5.
Originally a non-slang word, ain't began as a contraction for "am not", as in "I ain't stupid." When people began to use it improperly as in "He ain't", which should have been "He isn't", people came to consider it improper use of language. Today, it's known to be used predominantly in the south and by uneducated people.
I ain't yo' momma.

He ain't goin' to eat those nasty baked beans.
por Pitoyable 02 de Maio de 2005
 
6.
1. a combination of the words are not.
2. a combination of the words am not.
1. You aint going.
2. I aint going.
por dixielightning 26 de Julho de 2003
 
7.
A word so easy to say and understand, English teachers don't want you using it and make you read war and peace.

Ain't= Am not
Child: I Ain't trippin nigga gimme the money.

Teacher: Page 1-500 now you illiterate fool!
por Cocker spindler 05 de Janeiro de 2008