FIL
FIL definition by Slang.net
This page explains what the acronym "FIL" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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The acronym FIL stands for "father-in-law." When a person gets married, their spouse's father becomes their father-in-law. So, if someone asks you about your FIL, they're likely asking about your spouse's father.
Pop culture has taught men, especially, that they should be intimidated by their father-in-law. However, many men get along well with their FILs, with some even becoming bros.