Top Definition
Fucking Mother-In-Law.

For when your vitrolic loathing needs to spill forth, but in a tastefully discreet acronym.
"Dude, she's such a bitch, I think she's ready to become the FMIL."
by sheertone March 23, 2006
Future Mother-In-Law.

The non-dirty (and probably more oft-intended) version of FMIL.
"I hate getting emails from my FMIL."
by invisibelle December 10, 2008
Fuck my imaginary life.
Lochlan: Dude, even the imaginary version of Jane hates me!

Matt: Wow.. FMIL.
by Kookoo Hatterland August 08, 2010
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