2. Manganese is a chemical element in the periodic table that has the symbol Mn and atomic number 25. It is a gray-white metal, resembling iron and is quite brittle.
2. I knew this dude who tried to smoke Manganese and died. (not really)
used in Japanese BBSs to refer to foreigners who are enthusiasts of manga and waste time by reading manga and/or watching anime, and whose speech and behavior are mangatic; Manga otaku