Associated with "gosh darn" and "shucks."
Most common in southern and rural areas.
"The pigs got out again, sweet niblets"
Green Giant's brand product of canned whole kernel sweet corn.
A common southern expression used instead of shucks or darn, currently popularized by characters in Disney's TV show Hanna Montana.
However, it also has a hidden reference to Hillbilly corn, because they (her family) are from Tennessee, and her relationship to Dolly Parton.
This reference can be seen in The Beverly Hillbillies and the song "Rocky Top (Tennessee)" (by the Osbourne Brothers)
The hidden reference;
"Corn won't grow on Rocky Top ... that's why folks on Rocky Top get their corn from a jar" - "Rocky Top (Tennessee)" (by the Osbourne Brothers)