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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sister i like to fuck or finger
JONNI: Hey dougs sisters ass is so nice
Tom: I kno she is such a silf
by HOWZA95 February 19, 2009

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sister I'd like to fuck, <wink> jeff webb's sister <wink>
SILF, I love SILFS
by winkleman March 17, 2004

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Sister, I'd like to fuck (you like a wild animal)
Silf is the shit.
by Big Tool December 25, 2003

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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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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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Scholar I'd Like to Fuck
Chuck: "Hey bro, have you googled Nina Hachigian? She is such a SILF!"
by Charlwagle February 09, 2009

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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