忘其所以
      Explanation: Defined as the over-excited or proud of forgetting a due manner.
      Usage: Verb-object type; as the predicate attribute; containing derogatory
      Source: Ming Feng Meng, "Awaken the common saying Erlang survey documents boots" with instructions from his wife leans over, forget it so. "
  • Thesaurus:  forget, Mo to the poisonous, no one dare harm me— an arrogant boast