noun a fibrous material obtained by deviling rags or the remnants of woolen goods.
2. mungo ·add. ·noun a material of short fiber and inferior quality obtained by deviling woolen rags or the remnants of woolen goods, specif. those of felted, milled, or hard-spun woolen cloth, as distinguished from shoddy, or the deviled product of loose-textured woolen goods or worsted, a distinction often disregarded.