The abbreviation, used prodometely in southern regions, that is Can't and the improper word Ain't. Usually used when wanting to emphasize how impossible the task is.
C'ain't is an abbreviation of two abbreviations usually used in more Southern Regions of the United States. It's a combination of Can't and the improper word Ain't. It's meaning is double sided. It's used in the sense of you can't do it and you won't do it.
A cross between the standard englih contraction "can't"(can not) and non-standard english contraction "ain't" (am not). This combination of contraction forms a powerful word encompassing "can not", "am not", "is not", "are not", and "have not".