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

Encyclopedia: Thanks a million

• Orchis spectabilis
• orchitis
• orchotomy
• Orcinus
• Orcinus orca
• Orcus
• Orczy
• Ord kangaroo rat
• ordain
• ordained
• ordainer
• ordainment
• ordeal
• ordeal bean
• ordeal tree
• order
• order Acarina
• order Accipitriformes
• order Actinaria
• order Actiniaria
• order Actinomycetales
• order Actinomyxidia
• order Aepyorniformes
• order Agaricales
• order Alcyonaria