UPDATE: It looks like Bieber had a talk with (and apologized to) Bill Clinton following the above incident, judging from his Twitter.

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TMZ reports:

Justin Bieber is an oblivious, self-important little twit who goes out of his way to make the working man’s life miserable — just watch this video of the singer pissing into a restaurant mop bucket … and laughing like he’s the king of the world.

The clip was shot in NYC earlier this year — we’re told Bieber and his idiotic friends were leaving some nightclub, exiting through a restaurant kitchen, and Bieber decided he needed to take a leak.

But rather than go to a bathroom like a civilized person, Bieber — wearing pants that should literally be illegal — whipped out his junk and whizzed into a yellow mop bucket used to clean the restaurant’s floors … meaning whoever’s job it was to mop the place up had to physically change Bieber’s disgusting piss water.

And the worst part … Bieber’s friends act like the restaurant should be HONORED that the singer decided to piss there. It’s revolting.