Adjective owning or displaying an exceptionally abnormal or Ill state of brain See 245 synonyms and more non placet As an interjection to negate what was mentioned prior to or expose it as sarcasm, it is actually attested by 1900, popularized 1989 by "Wayne's Earth" sketches on "Saturday Evening Reside" https://holdenfmsyd.wikibyby.com/687955/getting_my_baumwolltaschen_to_work