dark side

(n) One’s evil nature; the evil flip side of an entity or idea. Term is often used in jest; (Concept has been long recognized by psychologists and theologians but given fresh meaning in the popular vernacular by the “Star War” movie series.)

A "dark-side" hacker (term used in the hacker community) describes someone who produces software or hacks with malicious or criminal intent.

“Don’t bug me, you don’t want to see my dark side.”

dark side by Bill Peters November 11, 2006

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Dark Side

To engage in sexual relations with female Midshipman at the United States Merchant Marine Academy at Kings Point, NY. Also popular among USNA Midshipman.
A person who has engaged in Dark Siding is commonly known as a Dark Sider, also less commonly referred to as The Emperor or Darth Vader, depending upon the attractiveness of the female involved and/or the number of instances of Dark Siding committed by the individual.

Hey did you hear about Smith, he's gone over to the dark side, poor bastard.

Dark Side by KP Setback June 29, 2006