“English is not a Jewish language. Yeshivish and haymish are not Jewish languages; they are euphemisms for bad English or tzibruchene Aynglish. “
German was not a Jewish language either, but somehow it became Yiddish (pun intended). People added some Hebrew, and after a while it became a Jewish language. At the same rate, give Yeshivish a couple hundred years and it will become the new Yiddish language.