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The act of masturbation, typically female. A reference to the recent movie Black Swan, in which the plot pretty much revolved around Natalie Portman's masturbatory habits.
Karen: Katie sure has been in her room for a long time.
Liz: She's probably doing the Natalie Portman.
Karen: Oh, that probably explains why she took that underwear catalogue.
by tccsn11 June 25, 2011
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