Related Clues:

• 'Ha ha, what a dork!'
• 'Geek sighting!'
• "Geek sighting!"
• "Check out the brain over here!"
• Shout after a too-bookish discourse
• Teasing words when someone starts listing the digits of pi, say
• 'Here comes Poindexter!'
• Jokey response to an overly technical explanation
• Jokey reply to someone geeking out