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Difference between Do the dirties with someone and Do the dirty on someone

do the dirties with someone(sl.) have sex with a person:

  • You just don’t understand that Sean and I are just friends. I don’t plan on doing the dirties with him.

do the dirty on someone —(coll.) do smth. bad and unfair to a person (also: do dirt to someone):

  • The Germans have been “doing the dirty” on us by donning khaki and kilts to approach our trenches.