One of my friends uses a German term, "schimpfen," that means "to scold" or "to reprimand." It's what one might use to describe someone berating a jaywalker for walking when the light is not green for pedestrians. Germans have been known to do this, although I can't say that I haven't been the direct recipient of this yet (thank goodness!).
I was having drinks with an international group and effected quite the laughter when I used what I thought was the correct word. The Germans died laughing, saying that the word I used wasn't a verb, which confused me greatly until they explained that I was using the German word for Smurfs.
So, one doesn't "Schlumpfen" someone else; they would schimpfen. Oy vey, do I feel silly! However, after reading some articles, I did find that in the Smurf world, they DO use the word "smurf" as a verb. So there.