Top Definition

for all the single ladies/guys

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

Katie: Nah I'm MFI!


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