Impressive; powerful. Said of code and designs which exhibit both complexity and a virtuoso flair. Has connotations similar to hairy but is more positive in tone. Often in the emphatic "most studly" or as noun-form "studliness". "Smail 3.0's configuration parser is most studly."
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Nearby terms: stubroutine « STUDENT « Student PL/I « studly » studlycaps » Stuffit » Stupids