1. An ironic thank you
   - thanks a lot 
2. An emphasized thank you
   - many thanks, thanks a lot

Encyclopedia: Thanks a million

• cinnamon-red
• cinnamon-scented
• cinnnamon colored
• cinque
• cinquecento
• cinquefoil
• Cinzano
• cinéma vérité
• CIO
• cipher
• Cipro
• ciprofloxacin
• CIRA
• circa
• circadian
• circadian rhythm
• Circaea
• Circaea alpina
• Circaea lutetiana
• Circaetus
• Circassian
• Circassian walnut
• Circe
• circinate
• Circinus