It's exactly what it sounds like.
In perhaps his most shocking stunt to date, Justin Bieber forgoes the more traditional means of relieving himself (by, oh I don't know, maybe using a urinal?) and opts instead for a yellow mop bucket in a restaurant kitchen. Captured on video posted by TMZ, the pop star, 19, laughs like he's having the time of his life and his friends egg him on while he urinates. The group then exits up the stairs, hooting and hollering, and Bieber exclaims, "---- Bill Clinton!"
The video was shot earlier this year in Manhattan as Bieber and his posse were exiting the establishment through the kitchen, according to the celebrity gossip site. Maybe he just REALLY had to go?
In any case, the fact that it was then a restaurant employee's job to dispose of Bieber's bodily fluids is almost as disgusting as the fact that the singer thought it was acceptable to do such a thing... and allow his friends to document it.
Now the question is, what's Bieber's beef with Clinton?