Taking a number 2 and a number 1 at the same time while in the bathroom, thus 21 - the perfect bathroom blackjack.

a small, light club used for knocking people out

A word applied for weed measurements. A blackjack is ¾ oz. (21g).

The word "blackjack" is derived from the popular gambling game, which is often called "21".

a fan of the k-pop group 2ne1.

in the card game, blackjack equals 21 which not only is pronounced the same as the group's name, but also signifies a win. therefore, the fans are referred to as blackjacks.

1. Noun: A sex position in which a man defecates on a woman's face whilst performing a "reverse 69."
2. Verb: The act of defecating on a woman's face whilst performing a "reverse 69". In preparation, the man usually drinks a pint of laxative, and then, whilst positioning his penis for insertion into the woman's mouth, instead releases a flood of watery diarrhea into her open mouth and upon her face.

A card game where you basically try to beat the dealer by getting as close to a total of 21 as possible without going over. A picture card and an Ace counts as 21, or Blackjack. This is one of the best games to play when you are in a casino given the low winning advantage of the house.

The only game worth playing in a casino. In all the other games, the house has a bigger advantage. Some people use a method called card counting to know when to bet high and when to bet low.
Also, the combination of 2 cards equaling 21 in the game.