Where does “zsírban” come from?

zsírban (Hungarian) comes from Hungarian zsír, from Proto-Slavic žirъ — feed?, fodder?, grease?.

Ancestry of “zsírban”, step by step

Step	Language	Word	Meaning
1	Hungarian	zsír	fat; fatty, adipose; awesome, cool, rad
2	Proto-Slavic	žirъ	feed?, fodder?, grease?