"Cushi" means "Negroe". "Cushan" is the mild pejorative form, meaning "N*gger", just like "Yehudi" means Jew and "Yehudon" (a word frequently used by Chaim in his Hebrew videos!) the mild pejorative meaning "Jew-boy" (= "Kike") cf "Frummer" and the mild pejorative "Frummak".
As part of the "race industry", in the west "Negroe" and "N*gger" have suddenly both become pejoratives and are taboo and even arrestable offences in many countries thanks to subversive leftists, liberals and hyper-sensitive spoilt Blacks, so too in Israel have "Cushi" and "Cushan" both also become suddenly taboo.
This is a sure sign that Zechariah's prediction of the destruction of the Negroidal/Hamitic branch of mankind is pending soon.