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1.
Save It For Me
Girl: I wanna go further with him I just don't want it to be awkward. What should I do?

Guy: SIFM!
by emyg33 July 13, 2012
 
2.
acronym for Stupid Ignorant Fucking Moron
Your mother is a SIFM for not remembering to make you a sandwich after she was finished giving birth to your younger brother.
by Mcjaigle April 08, 2010