- interjection showing that you do not like someone such as an actor, singer or politician
- noun an instance of making the sound ‘boo’
- verb to make a ‘boo’ sound to show that you do not like someone such as an actor, singer or politician
- noun marihuana. A former black slang word, adopted by hippies in the late 1970s. It is possibly a pre-World War II adoption of jabooby, an African term for fear, or else derives from the adjectival sense.