It is country word.I would never ever use it.
Same has other country words like I'm
fixin or I
reckon.
Fixin' - Intending. "I'm fixin' to go there next week."
Reckon - Guess, believe, suppose. "I reckon it doesn't make any difference."
Yes it is country.
The word supper in proper use comes before dinner .
In the country you have super a big meal and than dinner the light meal .
Supper is a name for the evening meal in some dialects of English. While often used interchangeably with "
dinner" today, supper was traditionally a separate meal. "Dinner" traditionally had been used to refer to the main and most formal meal of the day, which, from the Middle Ages until the 18th century, was most often the midday meal. When the evening meal became the main meal, it was referred to as "dinner"
https://en.wikipedia.org/wiki/Supper