QUATSCH: nuts, fiddlesticks, pulp, nonsense, jabberwocky, balderdash, flapdoodle. However you like it. The English language offers a lot of synonyms. Besides: The German language as well. („Mumpitz“ and „Schmonzes“ for example.)
But QUATSCH is very special and unique ‚cause it’s utterly onomatopoetic. It reminds me of stepping on an unlocked mustard tube … the yellow stuff oozing out … making this sound: QUATSCH.