boob1 Syllabification: (boob)Pronunciation: /bo͞ob/ informalTranslate boob | into German | into Italian Definition of boob noun 1a foolish or stupid person:why was that boob given a key investigation? 2British an embarrassing mistake. Origin: early 20th century: abbreviation of booby1boob in other Oxford dictionaries Definition of boob in the British & World English dictionary