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)
To supersize.
  That's one Big Mac and a milkshake: would you like to go large for just 40 cents?