Possible Clues:

• "Wow!"
• Wow: the famous Sir Walter
• 'Holy mackerel!'
• Expression of surprise after Sir Walter?
• ''Gadzooks!''
• "Dilbert" cartoonist Adams who gets an A?*
• 'Dilbert' cartoonist Adams who gets an A?*
• Exclamation of surprise
• My college's principal, unrestrained after Oxford honours course
• Line from 'The Rocky Horror Picture Show' that causes audience members to throw toilet paper at the screen