McShitfaced Share definition Flag The physical and mental fallout that follows eating anything synthesized at a McDonalds dining facility. I don't think I can drive home, man. I'm pretty McShitfaced right now. McShitfaced by TheFattestWeaboo August 6, 2011 0 0 Get merch Get the McShitfaced mug. Buy Now — $32.95 See more merch