One who studies an issue or a topic thoroughly or excessively: "leading a talkathon of policy wonks in a methodical effort to build consensus for his programs"(Michael Kranish).
n. an earnest student. (Collegiate.) : Yes, you could call Martin a wonk. In fact, he's the classic wonk.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
wonk
"overly studious person," 1954, Amer.Eng. student slang, popularized 1993 during Clinton administration in U.S.; perhaps a shortening of Brit. slang wonky "shaky, unreliable" (1919), which perhaps is from Ger. wankel- or from from surviving dialectal words based on O.E. wancol "shaky, tottering" (see wench). Or perhaps a variant of Brit. slang wanker "masturbator." It was earlier British naval slang for "midshipman" (1929).