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This is an uncommon acronym used to say "shoot yourself in the face". It is a more specific form of kys.
Guy 1: Did you see Deathly Hallows yet?
Guy 2: Hell no! Harry Potter is so gay.
Guy 1: Dude?
Guy 2: Yeah?
Guy 1: Syitf.
by (|-||_|(|< |\|0|2|215 November 24, 2010