Originally referring to baby boomers (born 1946-1964), now often used dismissively to describe someone perceived as out of touch or resistant to change. Can also refer to something that booms or makes loud sounds.
From 'boom' meaning rapid growth or loud sound + '-er' suffix. 'Baby boomer' coined in 1963 referring to post-WWII birth rate spike. Recent slang usage ('OK boomer') emerged in late 2010s.
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