Where does the expression BOBBE MA’ASES come from?

Where does the expression BOBBE MA’ASES come from?

The first chumash that was translated into Yiddish, was done by R. Eliyahu Bachur*.

He wrote tens of seforim on dikduk ,mesorah and ta’amim. He also translated and

wrote many seforim and books in Yiddish.

He translated (Yiddish) a story about a prince called Bobbe Dantuna. He called the

book, Bobbe Buch.

The expression Bobbe Ma’ases, started with his Buch. It has nothing to do with a

grandmother  but a prince called Bobbe.

*Most Seforim  who quote his Seforim, call him,  “Habachur”

  He was married , some speculate that he got married late

  and Habachur remained stuck to his name. Others claim Habachur

  means the chosen.