Schlonged - beaten with a snake or snake-like object.
A bull whip or horse whip resembles a snake.
An expert with a whip never even has to touch the victim with the snapping end of the whip, which has a crack much like the sound of a high-velocity bullet, and for much the same reason. The sound itself is caused by the tip of the whip moving at supersonic speed.
While the expression is rare, it has in fact shown up in earlier political contexts, typically from New Yorkers like Trump. The Post notes that Neal Conan, host of NPR's Talk of the Nation, said in a 2011 broadcast that the 1984 Democratic ticket of Walter Mondale and Geraldine Ferraro "went on to get schlonged at the polls." And on Fox News in 2006, Dick Morris warned that President George W. Bush was "going to get schlonged" in the midterm elections.
Long before that, the phrase made an appearance in New York City collegiate politics. The Daily Mail uncovered a 1967 article in the student newspaper of the City College of New York in which Ellen Turkish, a candidate on the losing slate for student council, said, "We got schlonged." (As Ellen T. Comisso, she would go on to a distinguished career as a political scientist.)