Mungo \Mun"go\, n. A fibrous material obtained by deviling rags or the remnants of woolen goods.

Note: Mungo properly signifies the disintegrated rags of woolen cloth, as distinguished from those of worsted, which form shoddy. The distinction is very commonly disregarded. --Beck (Draper's Dict. ).

Source: Webster's Revised Unabridged Dictionary (1913)
 

Mungo \Mun"go\, n. 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.

Source: Webster's Revised Unabridged Dictionary (1913)