Reason & Origins
X's (like J's) are pronounced in Spanish like an English H. Thus this slur is a mockery of their pronounciation.
The Racial Slur Database, since 1999. Not copyrighted in any way, shape or form.
This database was created entirely from data gleaned off the 'net and via submissions from people like you and your parents. It's supposed to be funny and/or informational.