boob1Pronunciation: /buːb/ informalTranslate boob | into German | into Italian Definition of boob noun 1British an embarrassing mistake: the boob was spotted by a security expert at the show 2North American a foolish or stupid person: why was that boob given a key investigation? verb [no object] British make an embarrassing mistake: police realized they had boobedOrigin: early 20th century: abbreviation of booby1boob in other Oxford dictionaries Definition of boob in the US English dictionary