Enthusiastically interested in detailed, specialized subjects like science, technology, or pop culture in a way some might consider uncool.
From 'nerd' (origin uncertain, possibly onomatopoeia from Dr. Seuss), with '-y' suffix making it an adjective. 'Nerd' emerged in 1950s American slang, possibly from 'nerd' = 'squid' in reverse.
Being nerdy used to be social death, but now nerdy interests (gaming, comics, sci-fi) are completely mainstream—it's basically the biggest social status flip in modern history, driven by tech becoming cool.
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