Quick answer: The player who draws a 2 chooses another player to drink.
What Does 2 Mean in King's Cup?
Two means “you.” Point to one player, and that person takes the agreed action. The turn ends immediately after the action, so this is one of the fastest Kings Cup rules.
Common 2 House Rule
Instead of a drink, give the chosen player a point, a trivia question, or a harmless challenge.
House rules differ by group. Confirm the meaning before the first card is drawn, allow anyone to choose a non-alcoholic alternative, and never pressure a player to participate.