twerp

noun3

1. •
   (informal) A fool, a twit.

   • Now you've broken it, you twerp!
2. •
   (informal) A small or puny person; one regarded as insignificant, contemptible.

   • Get out of my way, you little twerp!
3. •
   (US, informal) A person who can be bullied playfully, or easily teased. Sometimes used as a pet-name (often for a younger sibling).