Originally Posted by LarrytheBear
Ain't is one of those multiple use contractions...
We ain't... (We are not)
I ain't... (I am not)
He ain't... (He is not)
And then there is "cain't", meaning... Not going to do that even if I could.
It's not what you say or even how you say it that is most important... it's what you do.
Actually, I believe that it is the contraction for 'am not'.
In your examples, they are saying:
We ain't ... (We am not)
I ain't ... (I am not)
He ain't ... (He am not)
Which is why it is considered improper English. I believe you wrote in parentheses what people were trying to say, not what they actually were saying.
However, proper English or not, it is one of the many words that adds color and makes talking to people so much fun. If we all spoke proper English, it would like advertising Baskin Robins with it's 3 flavors of ice cream.