Nothingburger, sometimes spelled as nothing-burger or nothing burger, is a term used to describe a situation that receives a lot of attention, but which, upon closer examination, reveals to be of little to no real significance.
The phrase refers to the notion that a regular hamburger should have different flavorful ingredients, but if the meat were to be removed, all that would be left would be a "nothingburger", thus many ingredients might be on the outside, but upon further inspection on the inside, nothing remains.