bananas UK /bəˈnɑː.nəz/US /bəˈnæ.nəz/adjective 1forms 2phrases 1 adjective1 •Crazy, mad, nuts.I am astonished, really astonished, that you didn't put away some dough. You must be bananas. — 1976 formsmore bananas · most bananas Phrases with bananas go bananasTo get angry; to go mad.
