(pronounced: meksee-fluks) A term for expressing the rate of illegal immigration, specifically from mexico, into the united states. The recent problems with illegal immigration has spawned the need for a simple term for expressing the mexican infiltration. Like in heat transfer, the units can be of various types. For example, persons per hour or families per month per mile of texan border.
This term could be seen on the news ticker of Fox News or maybe along side the pollen/dust/allergen levels every day. In all likelihood it will follow the terror alert.
Consider this (in the voice of a newscaster): "Today's terror alert is 'elevated' however the mexiflux today is reduced after the recent frosting of crops in southern Colorado."