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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 07, 2013
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Jul 6 Word of the Day
Phrase meaning that a deceased cannot rest in peace until society changes due to the circumstances of a death.
People said rest in power for the unarmed man had been shot by the police.
by FooBarBiz October 12, 2017
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my fbil better watch himself before my bridezilla sister gets all crazy on his ass.
by TheRealCuddFoo February 04, 2011
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