Courtesy of Haaretz
And here they are in action, calling for peace:
Khaibar is the name of the last Jewish village defeated by Muhammad's army in 628. Many Jews were killed in that battle, which marked the end of Jewish presence in Arabia. There are Muslims who see that as a precursor to future wars against Jews. At gatherings and rallies of extremists, this chant is often heard as a threat to Jews to expect to be defeated and killed again by Muslims.