[Tlhingan-hol] Paramount Hol: "Sli'bah!"

[Felix Malmenbeck]

I seem to remember an episode of TNG (or possibly DS9) where a Klingon (Worf, I think) calls somebody a "sli'bah" or "shlee-bach" or "tlhIybaH" or the like. Pretty sure it was an insult.
Pretty sure it doesn't correspond to any known word in ta' tlhIngan Hol, but I'd still be interested in learning the context in which it was used.

Anybody know?