from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Slang Crazy: "That's the horrible thing when you're bananas—nobody can know the awful things that are going on in your head” ( Otto Friedrich). "City dwellers . . . are subjected to so much noise it drives them bananas” ( New Yorker).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of banana.
- adj. crazy, mad, nuts
From banana, worthless or crazy person, from banana.(American Heritage® Dictionary of the English Language, Fourth Edition)