Sister, I'd like to fuck (you like a wild animal)
Silf is the shit.
by Big Tool December 25, 2003
Sister I would like to fuck.
much like Milf, Gilf, Dilf(dad),Dilf (dog),Dilf(donkey)Cilf(child),Bilf,Cilf(cat)or any other farm animal.
Person 1:OH MY GOD, look at that chick.What a SILF.
Person 2: Dude, thats YOUR sister. That's nasty.
Person 1: It's called SILF for a reason dude. DUUU
by ill bang ur sister! December 08, 2004
sister i'd like to fuck

(same concept as milf)
that silf lives in your house?!?
by Spyder January 05, 2003
Sheep I'd Like To Fuck

Commonly Used in Wales
Welsh Farmer: oh, thats a mighty fine sheep
Welsh Farmer b: yes it is a silf.
by ROBERT SAVAGE July 08, 2006
Sandwich I'd Like To Fuck

A Sandwich made so perfectly one would be able to fornicate with previously mentioned sandwich.
"Oh man, that was such a good sandwich I'd basically call that a S.I.L.F."

Guy 1: "dude I just had the best S.I.L.F."
Guy 2: "What?"
by JoJo Martinez September 29, 2006
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