geek out

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geek out ‎(third-person singular simple present geeks out, present participle geeking out, simple past and past participle geeked out)

  1. (informal) To enthuse about a specific topic, not realizing that most people listening will fail to understand it.
    Sorry, I didn't mean to spend fifteen minutes discussing the definition of decimate. I guess I geeked out for a bit.
    • 2015, LeBron James' unfathomable workload
      Young remembers watching Game 3 while the trainers geeked out over the stamina of James, who was coming off two straight overtime games, including 50 minutes in Game 2.
  2. (informal) To do geeky things; to act geeky; to speak of geeky things.
    Hey guys, let's geek out tonight and have a code-a-thon!