After being cheated on by your spouse with your best friend, getting them back by hooking up with your best friend’s spouse.

This term comes from the factual scenario when Shania Twain’s husband cheated on her with her best friend. Shania Twain later divorced him, and married her best friend’s husband. This really happened, I shit you not.
Jim: “Wow, I can’t believe our best friends are idiots and decided to cheat on their spouses with each other.”

Rachel: “Yea, but that’s ok, the real winners are Mike and Sarah. They ended up Shania Twaining in the end.”
by Legitjosh February 2, 2019
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A Shania Twain occurs when something don't impress you much,
When Joel saw Glen's head he got his Shania Twain on.
by Swishfish October 22, 2006
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Shania Twain is a country singer who was raised out of poverty and is now the best-selling female artist in world history. Her music is country with a popish sound to it. She not only sings music, but writes her own music along with the help of her husband Mutt Lang (A.K.A. The producer of many famous rock groups such as AC/DC).
I heard Shania Twain's song, "Man! I Feel Like a Woman!" on a country music station. It's not your average country music, but yet it's not pop.
by Harley February 24, 2005
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The only country music you can listen to without throwing up.

Shania is a beautiful woman with a beautiful voice and is married to AC/DC producer Mutt Lange.
Shania plays guitar, sings, and writes all her own music. Her songs are upbeat and not like average depressing country music.
by Ana October 9, 2004
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A Canadian country singer with an interesting background. She writes her own songs and is VERY good.
Shania Twain is my favorite singer ever!
by shania's August 2, 2005
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The world's most expensive table dancer.
Shania Twain sure got a lot of money to lip sync and change outfits fourteen times in ninety minutes.
by circushead December 14, 2006
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a Canadian country music star who has had big pop hits in the fucking PC 90s and beyond. She is married to producer Robert John "Mutt" Lange who oversaw great music in the 80s but now produces mostly shit. Shania is sexier than hell, but her songs are yuppified, Ally McBeal fan type pop shit for the soccer mom set, totally awesome in their flat out suckability. Utter crap.
Shania Twain is very sexy but her songs don't impress me much. Her albums belong in the shitcan. Complete trash.
by I Saw U2 Live Twice December 23, 2006
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