The other person in a public restroom that prevents one from defecating comfortably. The silence might become so overbearing that the pooper is forced to leave prematurely.
verb: to plop block.
The act of being in a public restroom while someone else is trying to defecate.
girl 1 - "I was trying to poo, but there was a girl who was putting on her makeup in the restroom and would not leave!"
girl 2 - "Man, what a plop block!"
girl 1, shouting from inside the stall - "Stop plop blocking and leave!"