To do what you will.
That's literally all it means, in an "urban" manner. To
indulge in any manner of (usually rebellious or
hedonistic) activity is to 'eat cake'. Thank
Marie Antoinette, or some reasonable facsimile which has been lost to history, although she meant literal cake, the phrase has gained meaning since the
dipshit didn't leave a record of what she actually meant.
