As a Noun: 1. Unwanted things or material that is left over when something has been used, for example because the valuable or useful part of it has been taken out. English = rubbish, garbage, trash, waste. Formal English = refuse. 2. Something which is of very poor quality. English = rubbish. 3. An idea or a statement which you think is foolish or wrong. English = codswallop. Informal English = rubbish, crap. As a Verb or Adjective: 1. To be of very poor quality; to be no good. 2. Of ideas and statements, to be silly, foolish or wrong in your opinion.