damper, crimp, nix, veto, scotch, debunkification or discouraging word. Origins quite the mystery; no substantiation of the obvious contender, Polish sausage (kielbasa). WC Fields should have invented the term, but he did not. As of 2006, >99% of use is in the form "put the kiebash on".
Matrimony put the kiebash on those Vegas weekends for poor Kenny.