SOP Share definition Flag Sons of the Patriots, a lame system used in Metal Gear Solid Four. No one can actually hear Patriots however, because of nanomachine restrictions Merryl: All thanks to SOP Snake: SOP? ... Sons of the Patriots... Merryl: Lalelulilo? SOP by Zerostrikesback January 1, 2009 0 0 Get merch Get the SOP mug. Buy Now — $32.95 See more merch