boob
n. countable B1 Intermediate US //ˈbub// UK //bˈuːb// boob
n. a woman's breast, especially when used in a casual or slightly rude way.
n. the female breast; informal and often vulgar in register, frequently used in plural form.
Clipped form of booby (“fool”). Appeared near the beginning of the twentieth century; more information at booby § Etymology 1.
Clipped form of booby (“breast”). Appeared from the 20th century; more information at booby § Etymology 2.
Apparently shortened from booby-hatch.