FMF Day stands for Fuck My Friend Day.
While hanging out in the backyard, all of us friends declared it FMF Day. We went inside and fucked in a pile.
by Davey J April 26, 2007
Get the fmf day mug.
Taking a shit twelve inches in length in roughly five minutes.
I just took the biggest five minute footlong.

Did you see that "FMF" that was left in the toilet?

........Five Minute Footlong aka "FMF"........
by Mr. 5150 September 8, 2010
Get the Five Minute Footlong aka "FMF" mug.
Guy1: I gotta go outta home fmfs

Guy2: Damn dude you should've told me earlier
by why she is taken! February 21, 2021
Get the Fmfs mug.