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2.
MFI
To pass an extremely large turd, to the point of tears and ripping.

Comes From "to shit a wardrobe"
"Somebody help me, after last nights beerfest I've just dropped an MFI and now my rectums prolapsed"
by Colley301279 August 02, 2007
 
1.
MFI
MOTHER FUCKING INDEPENDENT

for all the single ladies/guys

in general mother fucking independent people.
Bryan: Are you a Gamma Phi??

Katie: Nah I'm MFI!

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"Screw boys...MFI foeva"
by philmob August 27, 2011