To shadowgirl is the act of joining a public gaming website and spamming it's forums and shoutbox with false information of yourself in an attempt to gain the attention of lonely males thus causing an explosion of drama. In most cases, the shadowgirl is likely an emotionally disturbed male and feeding it with attention will only fuel the aspie within it. Such false information is but not limited to saying you have a bionic leg after saving your friend, shooting yourself in the arm via ricochet from a soda can, falsely claiming stolen artwork is yours, diagnosing yourself with Multiple Personality Disorder and/or claiming you will kill yourself by drinking large amounts of water.
Did you see that skank on that Halo forum? It's another shadowgirl.
by Your Holy Savior January 4, 2014
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A shadow girl is the woman who is not even worthy enough to be a mans mistress

She is his toy

He dosnt look after her or care for her he just keeps her around to please him when he needs a break from his wife or girlfriend and from his mistress

The shadow girl is slightly more than a sex slave
I have my girlfriend and I have my mistress they cost me money but my shadowgirl is a cheap whore I respect her slightly
by Mistress-19-68 July 23, 2017
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