A glory hole is generally defined as a small fist-sized hole between private video booths in an adult bookstore. It is placed about hip high for the average guy and is just large enough to place a man's penis through to let the person on the other side perform whatever sexual activity he pleases on it.

Small holes between toilet stalls on the Interstate highway or in a shopping mall. Toilet areas friendly to this type of activity are often called Tea rooms.

Buddy booths are video booths where a glass partition with dual curtains separates the two booths. There is a button on both sides that first raises and then lowers one (but not the other) curtain. When both buttons are pressed by both people, both curtains rise and you can see each other. Buddy booths were designed to allow people to see but not necessarily touch each other. Some businesses have modified the booths so that the glass doesn't go all the way down to the bottom of the curtain. This allows you to see and feel each other at the same time with the safety of a wall between you.

Basically you get to cum or help someone else cum. Maybe both. Maybe just watch. A few people go there just to let someone else watch them cum.