The odd occurence that when you are going out with someone you inherit their best friend as one of your own good friends. Often occurs more that a girl will become very close to her boyfriends best mate than the other way round.

"You and Johnny are such good friends How do you even know him?"
"Oh Hes Toms best mate so hes my Best friend-in-law"

Best friend-in-law by WooBlackbetty December 9, 2008

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Best friend-in-law

When your best friend gets married to the person of their dreams and you’re also friends with that person. Kinda like usual in-laws but likable.

At the wedding Lewton stood up to give his best friend Fischer and his new best friend-in-law Kyla a congratulatory toast.

Best friend-in-law by KingLouie Daturd August 27, 2018

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Friends-in-Law

Those friends you HAVE to be friends with out of respect for someone you actually do like (especially your spouse). You see them at parties you don’t want to go to, you invite them to your parties and they don't bring anything, they friend request you, they ask you personal questions, they tell eveyone you are really good friends, you secretly hope they get a new job out of the country.

"So-and-so, or one of my friends-in-law, just showed up. After he gave me the half empy bag of chips he brought to share he asked me how our bankruptcy was going. Don't tell him personal sh*t and don't invite him anywhere ever again."

Friends-in-Law by girl on fire November 27, 2011

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friends-in-law

when two people are legally married but aren’t in love anymore, but still like to hang out, laugh and joke with each other. (Don’t take this too seriously lol I’m just trolling around)

-Claire’s parents aren’t in love, but she told me they were laughing together and joking at the family meeting. They didn’t even get a divorce, so I think they’re friends-in-law

friends-in-law by hellothereiamdokay November 11, 2021

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