banana split UK /bəˈnɑː.nə splɪt/US /bəˈnæ.nə splɪt/ noun2 •A dessert or sundae containing a banana cut in half lengthwise (split), ice cream and various toppings which may include sauces, nuts or fruit. •(euphemistic) Euphemistic form of bullshit (“a card game”). formsbanana splits