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fbil

Future brother in law. This designation can also extend to the siblings of the engaged couple. (See example)

Joel: when my brother proposes to your sister, we will be FBILs!

Aaron: best day ever!

by anjfbil February 08, 2013

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fbil

an acronym for future brother in law

my fbil better watch himself before my bridezilla sister gets all crazy on his ass.

by TheRealCuddFoo February 05, 2011

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FBIL

Future Brother In Law

My FBIL is coming down this weekend
future brother in law FBIL

by TheRealCuddFoo February 04, 2011

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