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1.
Fictional Character from the Twilight Series by Stephenie Meyer. Adoptive sister to Alice, Emmett, and Edward Cullen, "Twin" to Jasper Hale, and adoptive daughter of Esme and Carlise Cullen. They currently reside in the town of Forks, Washington. They are a family of Vegetarian Vampires meaning that they only feed off of animal blood. Rosalie is considered to be the most beautiful person in the world.
Page 20: "That's Edward and Emmett Cullen, and Jasper and Rosalie Hale. The one who left was Alice Cullen; they all live together with Dr. Cullen and his wife."
by i<3edward July 17, 2008
 
2.
The act of going insane on a person; may include yelling and screaming profanities and/or name-calling; derived from the excessively witchy character from Twilight, who is prone to such outbursts.
"Dude, she just went all Rosalie Hale on me!"
by twerd13 November 10, 2008