Twin in law

Someone who marries your Twin sibling ..
Jack: ayo twin in law come help me with this project
by __mybumhole__1 October 17, 2020
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Twin-In-Law

When one of the married couple shares the same birth date as the other spouses siblings.
Jon A. (birthday december 13) marrys Anna P. whos sister Kelly P. (birthday december 13).
Jon and Kelly are Twin-In-Laws!!!
by Jkasp November 13, 2009
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