<p><strong>Noun</strong></p><ul><li>A digital-technology expert or enthusiast (a term of pride as self-reference, but often used disparagingly by others).</li><li>A person who has excessive enthusiasm for and some expertise about a specialized subject or activity: a foreign-film geek.</li><li>A peculiar person, especially one who is perceived to be overly intellectual, unfashionable, or socially awkward.</li><li>A carnival performer who performs sensationally morbid or disgusting acts, as biting off the head of a live chicken.</li></ul><p><strong>Verb</strong></p><ul><li>(Used without object) To be overexcited about a specialized subject or activity, or to talk about it with excessive enthusiasm (usually followed by out): I could geek out about sci-fi for hours.</li></ul>