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1.
An event or occurrence that deviates beyond what is normally expected of a situation and that would be extremely difficult to predict.
Reeses' Peanut Butter Cups were formed by a Black Swan event when a truck carrying peanut butter ran into a truck carrying chocolate.
by kleinsound April 10, 2008
 
2.
Starring Natalie Portman, Mila Kunis, and Vincent Cassel. Directed by Darren Oronofsky.
Black Swan is one of the best movies I have ever seen.
by kyliecarefree January 26, 2011
 
3.
Verb. To dramatically wipe ones face off after performing cunnilingus, as seen in the movie "Black Swan" during the sex scene between Mila Kunis and Natalie Portman.
That guy from last night? He totally black swanned me.
by AvidFan1138 January 05, 2011
 
4.
To be engaged in sexual contact with your partner, from behind, in a swimming pool, then forcing their head underwater which each thrust. (this mimics the actual mating habits of swans)
I got so carried away when I was hitting that in the hotel swimming pool last night, I started to blackswan her.
by giraffe-o July 07, 2011
 
5.
Originated from the original motion picture Black Swan

(adj.) to look at someone in a suspiciously, sexually curious manner; paranoid.

(v.) to black swan one's self is to masturbate with your mother in the room; to fanatically fantasize sexually and paranoia based about someone of the same sex; to cup a women's vagina.

n.) someone or something that is paranoid, evil, dark, weird, mental disorder, and/or erotic; a woman who has lesbian tendencies; one who looks like they'll stab you or themselves with a mirror shard and put your remains in the bathroom
(adj.) "You look really black swan right now, could you please stop looking at me like that?"

(v.) "He totally black swanned my vag last night."

(n.) "Did you see that picture of Kristen Stewart? She totally looks like a black swan."
by PussyCatSaysMeow January 19, 2011
 
6.
(v)-To self-sabotage oneself when faced with high-stake, high-stress situations.
I black swanned myself before the exam on Tuesday by going out and getting drunk with all of my friends.
by WNKT February 19, 2011
 
7.
When you're at a rave and you see a dude turtle heading a butt baby. Possible with or without the standard denim cuttoffs.
Shit got crazy last night dude; I saw a black swan grinding on my cousin, just leaving a mess everywhere
by Uberdieduber April 05, 2014