The Natalie Portman 

The act of a woman performing anal intercourse on a man while wearing a strap-on. After intercourse, the man must then perform fellatio on the used strap-on. (Strap on preferably large and black in color.)

Guy 1: Dude it hurts so bad to sit down today.

Guy 2: Thats what The Natalie Portman will do to you man...also you need a breath mint.

The Natalie Portman by actionjackson888 March 14, 2011

Doing the Natalie Portman 

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.

Doing the Natalie Portman by tccsn11 June 28, 2011