somethingburger means something believed or claimed to be unimportant that turns to be of some importance. Lexicurio rates it Rare gem — a strength score of 82 out of 100.
Etymology
From something + -burger, by analogy with nothingburger.
noun
- Something believed or claimed to be unimportant that turns to be of some importance.“Despite the undeniable corruption, Hillary called the scandal "the biggest nothingburger ever." […] This was a somethingburger with everything on it, for crying out loud. And the media did its best to sweep it under the rug—not just for Hillary's sake, but Obama's as well.”