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1.
dishonest, unethical, or criminal acts
He always sends his henchmen to do his dirty work rather than doing it himself.
by Light Joker November 30, 2005
 
2.
To do something with intense enthusiasm. Also, can be another euphemism for sex.
"You finished that whole sandwich?!"

"Hell yeah, I dirtyworked it."

OR

"My boyfriend is coming home from college for Christmas Break. We're gonna dirtywork every chance we get."
by SirCramsAlot August 25, 2007