A Yekke (also Jecke) is a Jew of German-speaking origin.
Many of them settled in the vicinity of Ben Yehuda Street in Tel Aviv, leading to the nickname "Ben Yehuda Strasse."
Their struggle to master Hebrew produced a dialect known as "Yekkish."
The Ben Yehuda Strasse Dictionary: A Dictionary of Spoken Yekkish in the Land of Israel, published in 2012, documents this language.
[1] A significant community escaped Frankfurt after Kristallnacht, and relocated to the Washington Heights neighborhood of New York City, where they still have a synagogue, Khal Adath Jeshurun, which punctiliously adheres to the Yekkish liturgical text, rituals, and melodies.