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1.
To Portman, is to immediately flip-flop on a position due to recently publicized circumstances pertaining to ones own life that contradict previous stance or opinion.
Congressman Kats, who formerly voted against Medical Marijuana pulled a Portman today and is now in favor of such reform after himself being fined for possession of a baggy of marijuana found during a traffic stop.
by TZUNAM1 March 15, 2013
 
2.
(v.) to render something that was long enjoyable completely unpleasureable. For example, Star Wars or the Shins. The term came into use in reference to the stylings of one Natalie Portman, a terrible actress that wiped her ass with the Legacy of Star Wars and ruined the Shins by offering their music up as a lifechanging experience in the film "Garden State."
Shit! What is she going to Portman next? Dylan Thomas?
by T-Dog Jenkins March 20, 2005