geek
US /ɡiːk/
UK /ɡiːk/
1.
a person who is extremely enthusiastic and knowledgeable about a particular subject, especially one that is obscure or difficult
:
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He's a computer geek who can fix any software problem.
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My brother is a total history geek; he knows everything about ancient civilizations.
2.
a person who is socially awkward or unpopular, often associated with intellectual pursuits
:
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He was often called a geek in high school because he preferred books to parties.
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She felt like a social geek at the party, unsure how to interact.
1.
to act like a geek; to obsess over a particular subject
:
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He tends to geek out on vintage video games whenever he has free time.
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I could really geek out about the new advancements in space exploration.