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Covert masturbation in a manner which is not viewable by a third party.

Appearing on a webcam viewable from the waist-up, while masturbating out of sight.

The viewer of the Shadow Wanker is not generally aware that masturbation is taking place, although the term is sometimes used when the viewer is complicit in the activity.
"I chatted to that hot chick last night and she had no idea I was shadow wanking under the desk!"
by robertbowen October 05, 2007
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