Top Definition
A semi-erect penis.

Name after the building material of the that name (Medium Density Fibreboard) which is "not quite wood".
She was not an attractive lady. When it came to performing my gentleman's duties all I could muster was a poor MDF.
by Adeybaby January 08, 2004
my dear friend
Hey, thanks MDF!
by thegreatme November 29, 2009
Mini Dildo Forking, the act of sticking a mini dildo onto a fork then placing them in a formation on someones lawn. When the wind blows the dildos sway in the wind. Penises in the wind.
oh shit there are swaying penises in my lawn. looks like i got MDFed.
by MDF master January 18, 2011
"Morto di figa" in Italian, that is something like "starved of cunt to death".
"Segarsi col catalogo della Postal Market! Che mdf!"
by agve September 27, 2015
MDF stands for Most Defiantely Fuckable, also a MLG Halo 2 Team ran by Brandon in Illinois
*Hot Girls Walks By*
Old Man:Damnnn That Girl Is MDF come Here Sweeeeetie
by MDFBrandon March 08, 2007
Massive Dick Face. ; an insult that not only shocks but makes you rethink your whole insult list.
That guy Denis, he's a MDF. Has his shirt on backwards all day.
by BBQmess May 22, 2015

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