sandbagger

from WordNet (r) 3.0 (2006)
sandbagger
    n 1: someone who deceives you about his true nature or intent in
         order to take advantage of you
from The Collaborative International Dictionary of English v.0.48
Sandbagger \Sand"bag`ger\, n.
   An assaulter whose weapon is a sand bag. See {Sand bag},
   under {Sand}.
   [1913 Webster]
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