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When you give someone (you trust) your password and they start messing around with it as if it is theirs and reply to your e-mails/PMs usually stating that they're your account ghost.
Lily's friend: Hey, wussup?

Lily: Nothing, I went to the Green Day concert. Then I got an awesome shirt from the concert.

Lily's Friend: Really?! Awesome!

'Account ghost': Lily is not here at the moment so her account ghost shall be filling in for her. :B

Lily's Friend: WTF?! o.0
by Lily from gaia September 03, 2005
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