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It's free publicity for the casino and it encourages other players to keep gambling in the hopes of being featured in a news article or on social media. All with your consent of course with a picture for you holding a big check.

There are two basic colloquial words. Sandwich  is fine, as per Ian T's answer, but if you're in the South of England a frequent version is sarnie  (Bacon Sarnies, Fried Egg Sarnies, for example). If you're in't North, it's often Butty or Buttie (Chip Butty, Ketchup Butty, for instance).

From Dictionary of Slang, buttie or butty is sandwich, originally coined in Northern England and now used throughout. It is a colloquialism for a buttered sandwich.