When a group of thots proceed to take up an entire hallway/walkway whilst in an arm chain link, usually too engrossed in conversation to notice the social destruction they're causing.
"See that thotwall approaching? Always make sure to walk directly through it."
When your at any place or time the thots in your vicinity will gather to form a wall across a small pathway. To make it worse they feel insulted when you tried to get past them.