by Dangeriam December 9, 2009
by jd999 September 12, 2009
person Dada ad person Sham are dating and person Sham and person Yaya are best friends,Dada and Yaya are now best-friend-in-law
by Millionaire Hippe April 22, 2011
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"
"Oh Hes Toms best mate so hes my Best friend-in-law"
by WooBlackbetty November 16, 2008
If this law is called between two people that have agreed they are best friends then the person that calls the law is in a family related, relationship related, love related, school-related, or social related situation. After this law has been called the the opposite person of the one that called the law must help the caller until he/she says the name "Tim McGraw".
by George strait and Jones May 31, 2019
The best friend law is when you have a friend of the opposite gender and your both single around Christmas then you have to date
by Vexk December 19, 2021
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.
by KingLouie Daturd August 28, 2018