PseudoDictionary word of the day (one for the nurses, journos and police out there):
methylethylbadstuff - (n) Used by Orlando Fire Dept. Communications Specialists to describe any type of unknown hazardous material whether solid, liquid, gas or biological in nature.

e.g., "I don't know what kind of methylethylbadstuff that tanker was carrying but it's on fire now...whatever it is!"