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.”