Quick Definition: A biological term for “social gathering,” watering holes are where animals gather to drink and socialize.
In African safaris, the watering hole is the one location where the predator will not hunt the prey, and there is an implicit understanding of neutrality. This is based on the social hierarchy rules: everyone is here to replenish, recharge batteries, and socialize. A bar, for example, is a human watering hole.
Another example is the dog park:
The park is a social watering hole on Sundays for dog owners.