bananas

[buh-nan-uhz]
adjective Slang.
1.
crazy; deranged: All that chatter is driving me bananas.
2.
wildly enthusiastic: The crowd went bananas when the music began.

Origin:
1965–70, Americanism; see banana, -s3

Dictionary.com Unabridged

banana

[buh-nan-uh]
noun
1.
a tropical plant of the genus Musa, certain species of which are cultivated for their nutritious fruit. Compare banana family.
2.
the fruit, especially that of M. paradisiaca, with yellow or reddish rind.

Origin:
1590–1600; < Spanish < Portuguese (perhaps via Sp); akin to various words for banana or plantain in WAfr languages (e.g., Wolof, Malinke banana, Vai (Mande language of Liberia) bana), but ultimate source and direction of borrowing uncertain

banana, plantain.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
banana (bəˈnɑːnə)
 
n
1.  any of several tropical and subtropical herbaceous treelike plants of the musaceous genus Musa, esp M. sapientum, a widely cultivated species propagated from suckers and having hanging clusters of edible fruit
2.  Compare plantain the crescent-shaped fruit of any of these plants
 
[C16: from Spanish or Portuguese, of African origin]

bananas (bəˈnɑːnəz)
 
adj
slang crazy (esp in the phrase go bananas)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

banana
1590s, borrowed by Sp. or Port. from a W. African word, possibly Wolof banana. The plant introduced to the New World from Africa, 1516. Top banana, second banana, etc. are 1950s, from show business slang use of banana for "comedian, especially in a burlesque show." Banana split first attested 1920. Banana
oil "nonsense" is slang from c.1910.

bananas
"crazy," 1968; earlier (1935) it was noted as an underworld slang term for "sexually perverted."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
BANANA
build absolutely nothing anywhere near anybody
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Whisk together the dry ingredients at home and then add the wet ingredients and
  sliced bananas at camp.
Others sound so bizarre they could make you go bananas.
People hustle to put each animal on a clean towel in a cardboard box that once
  held bananas.
The church or chapel formed one side of a quadrangle, in the middle of which a
  large clump of bananas were growing.
Image for bananas
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