Yeah, "basta" means "enough".

The sicilian dialect doesn't use very hard consonants, so a single "p" in the beginning of a word sounds more like a "b". In addition to that, the letters "st", like in "Pasta" or "basta", become a "sht", so it's pronounced either way as "bashta".

BTW: Does anyone know how and where to apply for a part in "Godfather IV"?