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 8, 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 5, 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 4, 2011
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