why the worrd "KIKE" is offensive for Juish?

Question

I don't know exactly the meaning of this word as I am not native american. thx

Answer 1

Kike was used by American Jews in the 19th century to refer to those Jews who had immigrated more recently than themselves and were less educated.
The word was first recorded in print in 1904.
It is the "most widespread" of the pejorative words to describe Jews, and "has never lost its bite, and is not considered funny by contemporary Jews".