I believe it means that in order for someone to make you feel bad about yourself, you have to agree with what they are saying, and by agreeing you are giving them permission. Everyone has a right to their own opinion but we don't have to buy into other people's opinion of us.
During the digestion process, the first step would be mastication, lubrication with the saliva, and later on is being formed into a bolus. Bolus is the term used for food substance that is turned into small balls. When the bolus is formed, this is then pushed or moved to the stomach.
