SILF

When your sister wants you to fuck her. In most cases, brothers ask their sisters. But that's probably the only thing that sibs can agree on...
sex love sisters brothers ass yummy tits penis dick vagina seducer

Sister: Bro, come here for a sec...

Brother: What?

Sister: (strips off clothing)

And they lived happily ever after..
But she's a guy stealing SILF!

by The Girl Who Kicked Thru Iron August 21, 2010

SILF

Substitute I'd Like (to) Fuck

Johhny: "Did you see that math substitute today?"

Mark: "Yea, dude, she's a total SILF!"

by jjobin@99 March 1, 2011

SILF

Baily and/or Ridgly (Sisters of Smapdey). Also see the The B&R

Boy, smap's sister's are deffenately silfs. Especialy those tits and edible training bra!

by Chester January 11, 2005

silf

Sandwich I'd Like To Fuck

That sub at Quizno's is a SILF.

by Freakinhuge May 17, 2006

Silf

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 8, 2004

silf

sex i'd like to forget

dude, shack had some serious silf last night. He's still pissed off

by i banged your mom December 9, 2008

Silf

Sister I'd LOVE to fuck

Erin's sister is SUCH a silf;)

by erinssisterlover101 June 9, 2009