His Dirty Work

Dirty
/Dur-tee/
-adjective

unclean
vile; mean; sordid; contemptible: to play a dirty trick on someone.
obscene; pornographic; lewd: a dirty joke.
undesirable or unpleasant; thankless
very unfortunate or regrettable
hostile, insulting, contemptuous, or resentful.
-verb (used with object), verb (used without object)

to make or become dirty.
-adverb

Informal. in a mean, unscrupulous, or underhand way: to play dirty.
Informal. in a lewd manner: to talk dirty.
-Idioms

do (someone) dirty, Slang. to treat unfairly or reprehensibly, as by cheating or slandering.
-Related forms
dirt·i·ly, adverb
dirt·i·ness, noun