A large cup of beer (usually consisting a full beer) used in the game of flip cup. Term can be used interchangeably with "fatty mc" in case there are diesel mcnizzlers in present company, or mcnigger if you are in a daring mood.
Person 1: "yo dawg, you down to go mcniggers right now? I need a nice fatty mcnig to get me nice"
Person 2: "DUDE! CHILL OUT! Tyrell and his boys just rolled in!"
Person 1: "Oh dag.... Tyrell! Down for some fatty mc's?"
Tyrell: *pulls out a shank and proceeds to stab Person 1 profusely*