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

son i'd like to fuck

My oldest son is a silf

by GlizzyGoblin November 22, 2023

SILF

Per an application (Naughty Gifts) on the facebook: a "Sheep I'd Like to Fuck"

On Brokeback Mountain, Jack's ass was not the only thing that Ennis lusted for. There were a multitude of SILFs to deflower and so Ennis brought a new "silence" to the lambs.

by theportangel June 13, 2008

SILF

Stands for Sister I'd Like (to) Fuck.

Dayumm your sister really is a SILF.

by BlazeItDude March 7, 2018

Silf

Stepmom id like to fuck

Damn Lars stepmom is a silf
Ain’t you a girl

So?

by Romaniwandastan May 27, 2023

SILF

Sister I'd Like To Fuck

When your best friend's sister is so hot that you actually want to date them.

If they have a hot brother it is known as a BILF.

Oh my god, did you see Jackson's sister, she's such a SILF!

by hug2002 February 8, 2019