The act of turning on the sink of bathtub so no one can hear you take a shit. Whether it be in the next room because of paper thin walls or the neighbors in the apartment next to yours.
Taylor: Why did you turn the water on when you went into the bathroom? I know you didn't wash your hands for twenty minutes.
Jason: I woke up and had the biggest waterlog, but I just went back to sleep instead
or
Kevin: I gotta gotake a piss, I've been waterlogging for the last 10 minutes.