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1.
something lame, dead-end, a dud, insignificant; especially something with high expectations that turns out to be average, pathetic, or overhyped.
"much to the team's dismay, the number one pick in this year's draft turned out to be a nothingburger"
by Nutmegs June 10, 2006

Words related to nothingburger

dead-end dud lame nothing burger overrated
 
2.
Two pieces of bread slapped together with nothing in between. Usually eaten when you have nothing in the house except bread or are too lazy to spend 2 minutes making a decent sandwich.
Rob: My breakfast is usually just a nothing burger and a cup of coffee
Ann: Wtf you're so lazy, did you ever try eating decent food?
by Vasily Favoroff July 10, 2008