Syphilis; a dirty/infected person. Derived as a highly clipped, expressive slang abbreviation of the medical term сифилис (syphilis), featuring the popular productive slang suffix -ак. In everyday Russian street, school, and prison slang, it has three primary meanings: first, literally and crudely, the venereal disease syphilis; second, a derogatory descriptor for someone perceived as filthy, unsanitary, homeless, or diseased.
Ранним утром, собираясь на самолет, обнаружил вокруг шеи странную красноватую сыпь. ― Похоже на сифак, ― авторитетно заявила Бурзум. ― Суешь свой член всюду…
Early morning, getting ready for the plane he found a strange red rash around the neck. ― Looks like the syph, explained Burzum. ― You dip your dick into anything…
(Владимир Спектр, Face Control, 2002)
