Top definition
In-law in-lawsex (-0.697)
Your spouse's brother's/sister's spouse. Basically someone who will never be related to your kids, so you don't have to give a shit about. The feeling is mutual.
Your Wife: "My brother Todd's wife is such a cow!"

You: "Who gives a rat's? She's my in-law in-law."
by Uncle Des August 09, 2010
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