SILF 

1- Literally: Sammich I'd Like to Fuck

2- A sandwich so delectibly delicious that you'd like to first have your way with it before its yummy is in your tummy.

Man! I fucking need a SILF! We gotta go pick us up a pair of SILFs on our lunch hour today, Derek!

SILF by PopFree Monkey February 8, 2007

silf 

acronym for sister i'd like to fuck. derived from milf another acronym this time for mother id like to fuck.

damn phil's sister is a fucking silf

silf by Allay June 17, 2004

SILF 

Slut I Like to Fuck

She looks awesome. She's SILF definately!

SILF by Cuntslapdiver July 5, 2010

SILF 

sister I'd like to fuck, <wink> jeff webb's sister <wink>

SILF, I love SILFS

SILF by winkleman March 17, 2004

SILF 

S.I.L.F. Son I'd Like To Fuck.

Mother - "George, isn't our handsome son developing into such a SILF?"

Father - "I have a SILF and I'd like to stick my fat cock into his eager son-ass and ride him hard all night."

SILF by Architect of Desire May 14, 2008

SILF 

Student I'd like to fuck.
Used by teachers/professors.

Teacher 1: Did you see ____ today?

Teacher 2: Yeah.
Teacher 1: Daaamn, she's a SILF!

SILF by cmarchieyo. May 16, 2010

SILF 

from the word milf. SILF means sister id like to fuck!!

yo dude you sister is a silf!

SILF by Jscars March 13, 2009