The demigod bar is the imagined afterlife for demigods who have just ascended. After completing such a monumental feat, new demigods and demigoddesses would naturally want to put their feet up and relax with a refreshing beverage. To this end, players have been known to ascend with ice boxes filled with potions of booze (and an optional blessed greased figurine of a foocubus of choice).
The demigod bar does not actually exist anywhere in the game; it's pure fantasy amongst players.
- The NetHack stories by Virgo Vardja feature the demigod bar