ImpreSSive powerful. Said of code and deSignS which exhibit both complexity and a virtuoSo flair. HaS connotationSSimilar 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." [Jargon File]