Also known as Bull Dice.  Said to be the most popular dice game in San Francisco.  It's based on Poker dice hands with some omissions.  This game is played between two players who each play with five dice and a dice cup.

Both players roll their five dice simultaneously.  The player with the highest ranking Poker hand on this first roll is Boss.  If no ranking Poker hand is rolled, the round is void and players start again until a Poker hand is rolled.  The Boss then sets aside the dice that make up his Poker hand and rolls the remainder, keeping them hidden by his dice cup.  He can now decide to continue with the round or call it off depending on what he has rolled in his two rolls and what the other player has rolled in one roll and on what they may get with their second throw. 

If he decides he is unlikely to win and not to continue, he calls out "Pick them up!".  In this case, both players pick up their dice and start again and the round is void.  If he decides he has a good chance of winning, he calls "Come up!".  In this case, the other player decides to either keep some of his dice and roll the others again or he rolls all five again.

After both players have had two rolls, they show their dice and the highest ranking Poker hand, wins that round.  If both players have the same ranking hand, then the round is void and players start again.  The winner of a game is the player who wins two rounds out of three.

Boss Dice Poker hands in order of rank...

1 Five-of-a-Kind                                               Sixes ranking highest; 1s lowest.
2 Four-of-a-Kind                                               Sixes ranking highest; 1s lowest.
3 Full House  (Three-of-a-kind and a pair)     6, 6, 6, 1, 1 beats 5, 5, 5, 2, 2.
4 Three-of-a-Kind                                             Sixes ranking highest; 1s lowest.
5 Two Pairs                                                      6, 6, 2, 2, 1 beats 5, 5, 3, 3, 2
6 One Pair                                                        Sixes ranking highest; 1s lowest.