The author of the lyrics should also be mentioned: Zalman Shneur, 1887-1959. The genre is "more folkish than real folk". The translation above is strangely inaccurate.

"A bokher a shvartzer mit lokn mit shvartze, vi pekh" means "A black (-haired and -dressed?) student (of a religious school) with very black locks, like pitch" - evoking a costume and hairdressing worn by Jews in the former kingdom of Poland, later associated with conservative Jews.