Smutching

from The Collaborative International Dictionary of English v.0.48

Smutch \Smutch\, v. t. [imp. & p. p. {Smutched}; p. pr. & vb. n.
   {Smutching}.]
   To blacken with smoke, soot, or coal. [Written also
   {smooch}.] --B. Jonson.
   [1913 Webster]