by Sierra Bravo August 14, 2005

by C.S.Lewis. February 22, 2011

Cost per Orgasm: The amount of money invested in a relationship divided by the number of orgasms achieved during that relationship. Typically, the CPO is very high during the formation (dating) stages of the relationship. Once the relationship has formed the CPO sharply declines then gradually increases over time (usually during marriage) until the CPO exceeds the original formation stage.
by LeeC December 16, 2006


Certified Pop Off. An event that you would consider more enjoyable that your typical Friday night. You know something was a Certified Pop Off if everyone is talking about it.
That concert last night was a CPO!
by SheeshM August 15, 2017

by aum108 October 03, 2007
