Go Large Meaning
(idiomatic) To enjoy oneself to the maximum.
Example: Kevin & Perry Go Large (2000 film)
"An' hustlin' drunken soldiers when they're goin' large a bit/Is five times better business than paradin' in full kit" (Tommy, Rudyard Kipling 1890)
That's one Big Mac and a milkshake: would you like to go large for just 40 cents?