noun. A metric buttload of fungal mycelium and fructifications on the surface of Zeus knows what.
Real citation: "Thought I'd pass along some fun and perhaps encouraging news. Portland, as I'm sure you ALL know is not only the Rose City and the home of mega-mildew and banana slugs, but it is also the reknowned microbrew capital of the continental USA."
(Marcia Sinclair, June 24, 1996, http://www.ibiblio.org/pub/academic/agriculture/
Made-up citation: “My mildew-dar is not as strong as it could be, but even I am appalled and chagrinned by this mega-mildew and the advanced civilization it has brought forth in your bathtub.”