Definition of have or give it large in English:

have (or give) it large

British informal Go out and enjoy oneself, typically with drink or drugs; go clubbing: are you still having it large every weekend?
More example sentences
  • It was the sound of having it large, having a laugh and having the musical ‘x’ factor to match the headline-grabbing boasts.
  • Dark, sleek, minimalist and atmospheric bordering on sinister, this is the kind of club where you might see Darth Vader having it large.
  • Some celebs were actually earning a crust rather than just living it up and having it large.
See parent entry: large