Russian mat

Mat (Russian: мат; матерщи́на / ма́терный язы́к / мáтный язы́к, matershchina / materny yazyk / matny yazyk) is the term for vulgar, obscene, or profane language in Russian and some other Slavic language communities.

Mat has thousands of variations but ultimately centers on four pillars: the words (1) khuy ("cock"); (2) pizda ("cunt"); (3) yebat' ("to fuck"); and (4) blyad ("whore").

The first terms used in mat is khuy (;  хуй ) for cock, penis, or for an equivalent colloquial register: dick. The etymology of the term is unclear. Mainstream theories include from Proto-Indo European (PIE) *ks-u-, related to хвоя (khvoya, "pine needles"), attributed to Pederson, 1908; from PIE *hau-, related to хвост (khvost, "tail"), attributed to Merlingen, 1955; from Mongolian хуй (khui, meaning "sheath" or "scabbard"). This was the etymology endorsed by the Soviet government and attributed to Maxim Gorky, who claimed it was a loan word, imposed during Mongol yoke. A Gorokhovski suggests the derivation from Latin huic (lit. "for that", used on prescriptions for genital diseases) as a euphemism, because the old Russian "ud/uda" (from PIE root *ud- meaning "up, out") became taboo in the mid-18th century. Currently, the first volume of the Great Dictionary of Mat by the Russian linguist and folklorist Alexei Plutser-Sarno treats only expressions with the stem хуй (khuy), numbering over 500 entries; 12 volumes are planned.

...
Wikipedia