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!
by PopFree Monkey February 06, 2007
Bailey and Ridgely, silf=sister-i'd-like-to-fuck.
Dude, the silf is rockin'
by kate January 11, 2005
A sister you would like to have sexual intercourse with. Usually goes by the name Danielle or something close to that. Usually has one brother.
Stuart- Woah! his sister is such a silf by the way!!!
by Roycropperfan999 December 24, 2010
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!
by cmarchieyo. May 15, 2010
SECRETARY I'D LIKE TO FUCK
CHRIS: DO YOU HAVE A SECRETARY
CEDRIC: YES, WHY DID YOU ASK?
CHRIS: NO REASON
CEDRIC: BUT SHE IS A HOT SILF
by SILF FUCKER April 19, 2010
Sister or Sister in-law I'd like to fuck
Hey Brandt, your Sisterin-law is a SILF!
by Achilles2009 April 16, 2009
from the word milf. SILF means sister id like to fuck!!
yo dude you sister is a silf!
by Jscars March 12, 2009
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