banana

banana oil nonsensical talk; bullshit. US and Australian informal

banana republic a small tropical state, especially one in central America, whose economy is regarded as wholly dependent on its fruit-exporting trade. derogatory

go bananas

1 become extremely angry or excited.

2 go mad. informal

❶ 2013Business Insider Twitter's revenue growth, meanwhile, should still be accelerating … when the company goes public. And Wall Street goes bananas about growth like that.

second banana the second most important person in an organization or activity. informal, chiefly North American

top banana the most important person in an organization or activity. informal, chiefly North American

☞ The two expressions above originated in US theatrical slang. The top banana was originally the comedian who topped the bill in a show, while the second banana was the supporting comedian.