This usually defines things found on Thanksgiving, like Mashed 'Taters and gravy, Mac and Cheese, and Ice Cream.
Occasionally it may refer to a person, but it's not recommended to do so, as it can be very insulting.
Janice, this fresh apple pie is absolutely nomlicious, you put just the right amount of cinnamon in it!
Daa-a-amn, that girl's booty is nomlicious, oh I could hit that! Mm!