The definition of humongous is slang to describe something enormous or extremely large in size.
A 20,000 square foot house is an example of a house that would be described as humongous.
Informal of enormous size or extent; very large or great
Origin of humongousprobably blend and amp; alteration of huge and amp; monstrous
Extremely large; enormous: “humongous baked potatoes piled high with sour cream” (Boston Globe).
Origin of humongousPerhaps blend of huge and monstrous or tremendous.
(comparative more humongous, superlative most humongous)