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Another name for a stalker, or someone watching someone.

Usually used when someone is watching someone else. (Such as if they suspect them of cheating on them for exmaple.)
Person 1: Hey I hear your girlfriend has been seeing another girl.

Person 2: Tell her she going to have a second shadow from now on
by A15kk February 23, 2013
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Commonly your younger brother or sister who stands right behind you because they are shy around people they don't know or you have to mind them and they take mums words "Stick close to your older brother/sister" literally.
Friend:Oh my God did you see Game Of Thrones yesturday when they-

Me:Shhhhh... I have a Second shadow
by Shitionary May 16, 2016
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