I have been reading xkcd in German, via xkcDE. I was reading this one, and was very confused by a word in the third panel, ‘scharch’. It’s clearly to show that the character is bored; in the original the character just says ‘zzzzz’. But is this a common word in German; is it dialectical or regional? Does it have any meaning besides how it’s used in the comic, as an interjection?
I’ve Googled this term, and looked in a German dictionary, but I can’t find anything.