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FSIL

an abbreviation for Future-sister-in-law.
Jenn and I are FSILs for life, becuase I am marrying Nick Jonas and she is marrying Joe Jonas.
by Me =) April 10, 2008
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fsilly

Very stupid or silly
That was such a fsilly answer!
by Benfine Define October 31, 2020
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Related Words
FSIL • fsilly
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