Servus, and various local variants thereof, is a salutation used in many parts of Central and Eastern Europe.
The phrase is an ellipsis of a Latin expression servus humillimus, domine spectabilis, meaning "[your] most humble servant, [my] noble lord".
It is especially popular in Austria, Hungary, Slovakia, Romania (mostly in Transylvania), as well as in southern parts of Germany (Bavaria, Baden-Württemberg, Palatinate, middle and southern Hesse), northern Croatia, eastern Slovenia (mostly in Slovenian Styria), and western Ukraine.
[1] Despite its formal origins, servus is now used as an informal greeting in Bavaria, Baden-Württemberg, Austria, Südtirol, Slovenia, Hungary, and Romania.
[1] In Hungarian, several shortened versions of szervusz remain popular, like szevasz, szeva, szia, and szió.