Big Chug is a brand of drink fountains that appear in GTA 6.
The company initially appeared in GTA Online, where Big Chug branding appeared as part of the Arena War game mode in the Maze Bank Arena. In the multiplayer title, advertisements for the drinks company reveal that Big Chug drinks are available at nearby concession stands.
However, the business did not appear physically until GTA 6, where two enormous Big Chug cups can be seen near a drinks fountain in a scrolling video of 
Considering the enormous size of both visible containers, these are likely the 'Chuggernaut' options first revealed in the GTA Online ads. Another large size confirmed to be available is the 'Bucket.'
Big Chug is an obvious play on the real Big Gulp soft drinks, which are typically found in 7-Eleven stores.
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