Yet another example of stupid name calling.
"Kike" was (is sadly) a derogative term for "Jew".
According to Leo Rosten, author of Joys of Yiddish, the word might come from the fact that when arriving at Ellis Island, Jewish immigrants who were unwilling to sign an "X" (possibly due to its resemblance to a cross) signed an "O". The term for circles in yiddish is "Kikel" or "Keikl" (KY-Kel) and little circle "Kikeleh".
Apparently, the immigrants continued using the Kikel even after Ellis Island; and eventually to both the immigration inspectors and the rest of the nation, they became known as "kikel men" or "kikes".
I do hope that it isn't fear of a word that has kept this node so long empty and rather oversight. To not define a word with the hope that its meaning be forgotten or that ignoring it will allow the same is to hope that our mistakes will be similarly forgotten. Such a thing should not be allowed to happen.