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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 08, 2019
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"SILF" is an acronym for "Sister I'd Love to Fuck", which means someone's sister who'd you like to have sex with.
Boy #1: Gosh- Lily's sister is such a silf!
Boy #2: They are both silfs dude!
Girl #1: You guys are both right! They are silfs.
by Brainrotgobrrrr April 26, 2021
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SILF(Sister I Liked To Fuck) typically can be a term used as a friend's hot sister or a girlfriend's sister
Jerry:man Victoria's older sister is a SILF man there are so many things I would do to that piece of ass. Marcus:dude I know and I'm Victoria's study partner for physics and all I do is stare at her sister the whole time.
by Mayorofpoundtown February 22, 2014
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(High school) Senior I'd Like to Fuck.

Similar in concept to MILF.
OMG! He's totally a SILF!
by TotesMcGoatsAFILF May 01, 2014
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