When a different culture adopts cultural traditions of another culture.
This's a very common process in diverse locations and open-minded people, in which multiple cultures accept and adopt others' traditions.
This's rarely a bad thing - examples of when "
cultural appropriation" is when the Nazis adopted the Swastika (卍) from Indian religions and therefore gave it a bad name.
Barbaric philosophy of SJWs conclude that cultural appropriation is
a grave sin. This SJW philosophy has very common traits with racial segregation, apartheid, racism, and likewise. Although SJWs believe that they're politically correct, this racist barbaric philosophy can easily be categorized under hate speech, discrimination, or racism, or in the support of thereof.