When you really have to go poop but your wife, your girlfriend or kids do not want you to go poop because it will stink the bathroom.
Husband: Hey are you done with that magazine I really need to go poop!
Wife: Don't go and poop in there!! I need to do my make up! Wait till I get done!
Husband: Do not be a poop block!!!!!!
The one solid piece of poop that is stopping you from a diarrhea disaster.
Thank goodness that i had a poop block during that party or else things would have gotten ugly!