Related Clues:

• School geek
• Bookish sort
• High school outcast
• Tube diameter
• Screech or Urkel
• Make sleep
• Bill Gates, snarkily
• Antisocial sort
• Drill a hole
• Tiresome speaker
• Techie, stereotypically
• Inner diameter
• Bloviator, often
• Arouse ennui
• Slashdot reader, maybe