According to Wikipedia, a glory hole is defined as:

A glory hole is also a hole in a wall or partition, often between public lavatory stalls or video booths which can be used to look through to see the person in the next cubicle (see voyeurism) or to engage in sexual activity with the person next door.

A man may put his penis through the hole to engage in oral, anal or vaginal intercourse while maintaining a certain degree of anonymity. This usually happens in established sex clubs or adult arcades, theatres and bookstores. Glory holes in normal public lavatories are mainly used as peep holes, although certain areas are established meeting places at which people can engage in anonymous sex.

The glory holes in adult theaters are some of the best places to troll for black cock. The guys are always horny and when a black man finds a willing white slut on the other side of that gloryhole, their dicks get as hard as a piece of steel and they’ll cum buckets of jizz. Nothing can make you feel more like a dirty black cock slut than getting down on your knees on the cum-crusted floor of a video booth to service a black man whose face you might never see.