scudge
"chris: "john did you forget to rinse out your cup?"  john: "i'm not sure why?"  chris: "there is some dried milk scudge in the bottom of this cup
a contraction on scum and sludge
""chris: "john did you forget to rinse out your cup?"  john: "i'm not sure why?"  chris: "there is some dried milk scudge in the bottom of this cup" What is the definition of "scudge"?