from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Slang Extremely large; enormous: "humongous baked potatoes piled high with sour cream” ( Boston Globe).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of an extremely large size.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. (used informally) very large
Perhaps blend of huge and monstrous or tremendous.(American Heritage® Dictionary of the English Language, Fourth Edition)
From huge + monstrous (Wiktionary)