adjective very ugly. Probably derives from US BIFFER (an unattractive woman); however UK theories abound, including: 'Biffo the Bear' in the Beano comic from 1948, simply known as 'Biffo' by the 1990s; 'Biffa Bacon' in the later Viz comic; and the familiar company name, 'Biffa Waste Services' UK, 2003