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

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

Son I’d like to fuck

My son Joshua is a silf, all the men and women want him.

by Milfeeee March 3, 2019

silf

a sister who is hot, basically a milf but a sister (silf)

person 1: ay! is your sister a silf?

person 2: uh ig...

by ursisterisasilf October 5, 2021

Silf

A hot older sister.

"Mann your sister is such a silf"
"what the fuck shes my sister"

by Jocelyn the Helicopter June 4, 2021