The first half of "hip hip hooray" is adapted from "hep hep," an old German shepherds' herding cry. That is, actual shepherds from Germany. Not the dogs.

Well, it was, up until around 1819, when the citizens of Germany and other neighboring countries began using it as their rallying cry while going Hebrew-hunting in the Jewish ghettos. So keep that in mind next time you're trying to come up with an appropriate cheer at your cousin's Bar Mitzvah.
"We won the little league game! Hip hip hooray!"
"We won the little league game! Let's go kill some Jews!"
by Ruschitt December 4, 2018
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