I have decided that "ain't" actually is a word. It is simply a contraction of "are is not". Incorrect at best, but an actual word, in my opinion. HOWEVER . . .
Since it is a contraction it should be written: a'i'n't
Weird, but correct . . . more or less. (Well, ok, less)
So, everyone use it repeatedly, but spell it a'i'n't. And if someone questions you, tell them it a'i'n't your fault, Troy told you to do it.