I think this word means: Some kind of calamity or disaster.

Actual definition:  \my-AZ-muh; mee-, noun:
1. A vaporous exhalation (as of marshes or putrid matter) formerly thought to cause disease; broadly, a thick vaporous atmosphere or emanation.
2. A harmful or corrupting atmosphere or influence; also, an atmosphere that obscures; a fog.

Remark: Gross.