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Noun. Short for Best Friend in-law. Pronounced biffle. The spouse of your best friend or your spouse's best friend.
Congrats for marrying my best friend; you will make an excellent BFIL.
BFIL by Kit17 May 15, 2014
Related Words
BFIL BFILF
"I've secretly liked her for a while, she's a BFILF"
BFILF by The Original BFILF October 14, 2008
boyfriend id like to fuck

basically ur friends boyfriend whos so hot that ud wanna fuck em as well
girl 1: omg ur boyfriend is so hot 🤩
girl 2: ikr 🥵
girl: damn he's such a bfilf id luv to smash him 😋
bfilf by snottyassboy October 30, 2021