The act of Masturbating using someone else to control your arm motion; in a piston or wheel like fashion. You hold onto your own genitals; the other person controls the stroke of your arm from your forearm.
Described in Kevin Smith's " Zack and Miri make a Porno"
I totally got off when Ms. Blackston grabed my arm to drag me to the principle's office. I just grabbed myself while she pulled me. It was a total Dutch Anchor.