I was like hey wargo, he goes what do you want, I said besides your sister and then he threw a sandwich at me in disgust
by Ruben Mothballs June 15, 2003

A silf is a "sister i'd like to fuck". it is the same idea as a milf. Silfs are usually absolutely georgous, sexy, irresistable, and extremely flirty
by alwaysaladybug February 22, 2011

SILF or SILFing. Self Inflicted Laughing Fit.
A SILF occurs when you do or think about something that amuses you so much you have a laughing fit. You might send a text to a friend that makes you collapse on the floor with laughter.
A SILF occurs when you do or think about something that amuses you so much you have a laughing fit. You might send a text to a friend that makes you collapse on the floor with laughter.
"I just handed out brochures whilst doing the chicken or beef dance to the theme tune of Air Crash Investigators. hahaha tears! I just SILFed myself!"
by VIK&GABS March 6, 2014

Hey Jim, check out the whiskers on that small pink slightly curved sea dweller! A regular SILF and no mistake! High five!
by Roger McTodger November 16, 2004

by Mr. Skully January 13, 2019
