A term used to describe two or more amounts, physical or metaphorical, that seem to take on a property of percentage. That is, when one amount rises, the other must drop in order to keep the maximum percentage at one hundred. (100%) This normally works against someone, especially the one who points out the counter-proportion.
It seems like the amount of friends a guy has on MySpace or Facebook is counter-proportionate to how many friends he has in real life.
God, it seems like the more this kid I'm babysitting likes a toy, the more noise it makes, the less I can enjoy myself while I'm watching him. Money be damned, I'm not doing this anymore.