I was reading a quote from Joe Biden, “So all this stuff is like so much Fluffernutter out there.” Since I had not heard the term, went to see what he meant.
A fluffernutter is a sandwich made with peanut butter and marshmallow creme. Its name comes from the common use of "Marshmallow Fluff" brand marshmallow creme. It is popular in the Northeastern United States, where Joe is from, and has been proposed as the official Massachusetts state sandwich.
It is made by spreading peanut butter on a slice of bread then spreading an equal amount of some kind of marshmallow (small, large or cream) on another slice, and combining them together to form a sandwich. "Fluffernutter" is a registered trademark of Durkee-Mower Inc., the maker of "Marshmallow Fluff" brand marshmallow creme.