SISOSIG Share definition Flag Acronym Used In The Rythm/Music Game: Rock Band. S=Should I=I S=Stay O=Or S=Stay I=I G=Go Hey, wanna play Rock Band? I'm in the mood for some SISOSIG SISOSIG by AaRoNGhIi June 24, 2008 0 0 Get merch Get the SISOSIG mug. Buy Now — $32.95 See more merch
