A jerk; a person who is unlikable, detestable, or contemptible because he or she is stupid, foolish, clumsy, oafish, inept, malicious, or unpleasant.
A deplorable, pitiful person.
A small or puny person; one regarded as insignificant, contemptible.
A fool, a twit.
A person who can be bullied playfully, or easily teased. Sometimes used as a pet-name (often for a younger sibling).