Smelly brother corresponds to smelly sister. Smelly younger brother and smelly younger sister are humorous stalks used to express "you are almost a bad person". "Smelly little brother" has different meanings in different contexts: it is similar to the big bad guy, and there is a feeling of playing the fool in it, such as smelly little brother, only you hate it. It also refers to a child, which means to look down on him, or to have a bad mouth and often call names. Smelly brother corresponds to smelly sister.