Top Definition
Mean Dick-Sucking Face

You've all seen a girl with an MDSF, you just haven't realized exactly what you were seeing. She's got that look in her eyes: she takes it, and she takes it deep; it looks like she hates everything about the act, but she CAN'T and WON'T stop.
Man #1: There's this girl in my Logic class, man... she got a fat booty and an MDSF
Man #2: Yaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa!
by icking1 February 15, 2006
Massive Dildo Sucking Fuckwit
Bill: Dabe you're a Noob.

Dabe: Fuck off Bill, you're such an MDSF
by Bilfred April 27, 2010
Massive dildo sucking fuckwit
Dave is a MDSF!!
by davethegeespud April 27, 2010
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