Definition from Wiktionary, the free dictionary
Short for booby. The noun sense "dummy" dates to 1909, while the noun sense "breast" dates to 1945.
boob (plural boobs)
- (informal, pejorative) Idiot, fool.
- (slang) A breast, especially that of a human adult or adolescent female.
- To behave stupidly; to act like a boob.
- (informal, intransitive) To make a mistake
1969, “Alchemy”, The Canadian Forum, volume 49, page 211:
- ...the younger generation will not altogether be grateful for the book in which they are contained — especially when he boobs in calling the Weavers a rock ensemble.