Informal a bar or tavern, esp. one in which there is much social activity
See watering hole in American Heritage Dictionary 4
noun In both senses also called water hole.
A small natural depression in which water collects, especially a pool where animals come to drink.
Informal A social gathering place, such as a bar or saloon, where drinks are served: “a Warsaw restaurant that was once a cosmopolitan watering hole for actors and writers”(Newsweek).