The toilet in dreams is the symbol of the point where all of the negative things are being put. The dream shows that all of the negative emotions and thoughts you were carrying with yourself are no longer in your life, because you already flushed the toilet and left all of the negativities behind. If the toilet is overflowing or you are unable to flush the toilet, it means that you have problems while getting rid of all the negativities. If you flushed into the toilet something that is important to you, it means that you should pay attention to everything you do and become more careful, otherwise you will be sorry for the consequences. To get more detailed dream interpretation, please also see the meaning of toilet.
Read more about dreaming of Flushing (a toilet) in other dream meanings interpretations.