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1. CPO
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.

“The first three months are great; we’re going at it like rabbits. My CPO is at an all time low.”
2. CPO
compulsory purchase order
a decision made in a court of law giving a government organization, etc. the right to buy private property if it needs the land to build something that will be of use to the public, such as a new road:

After the compulsory purchase order (CPO) for a road or motorway has been granted, notice of the order is published by the Local Authority.
3. cpo
Chief Petty Officer in the United States Navy.
Chiefs kick ass, metaphorically and literally
by Sierra Bravo Jul 22, 2005 add a video
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