When a person negatively preaches or Speaks loudly to a group of people, Making sure the subject of the speech places all the blame on the group of people, and not on the Soap-Boxer Example: I would have taken lunch earlier, but my manager was Soap Boxing us to death...
SOAP-BOXING
Meaning of SOAP-BOXING in English
Slang English vocab. Английский сленговый словарь. 2012