The rule of thumb is Mc + sexual/genitalia slang term + item of clothing/bedding.For instance you might say, "Oh, I see McWanksocks says we're going to try and win at Old Trafford. Yeah right McFannytrousers, you couldn't win a goldfish at a guaranteed goldfish prize event." Or, you might let off steam with a cheeky "Heskey is starting again. When will McSpunkquilt learn?" and then put the world to rights with "Just fuck off McCockpants, just fuck off."