An amount of marijuana, consisting of 21 grams or 3/4 of an ounce. Can run anywhere from up at 200-240, when dealing on face value, being swindled or if for good product, down to 140 or 150, usually a hookup or for skank weed.

A blackjack is extremely uncommon in the drug market. A blackjack is usually sold as a favour from the seller, or under similar extraordinary circumstances.

The name blackjack can also refer to when a person sells 14 grams of a skanky blackjack at face value. Thereby sucker punching someone, leaving the seller with a free quarter-ounce.
My buddy's 21st birthday is this weekend. I'm thinking I'm gonna need more than a half-O, but I can't afford a full ounce. Hopefully, I can get a blackjack and my roommate will buy out the rest.

This weed ain't that good, but i got it free from blackjackin' those freshmen jocks.

by Phantom of the Night April 18, 2007
Top Definition
Taking a number 2 and a number 1 at the same time while in the bathroom, thus 21 - the perfect bathroom blackjack.
After 2 hours of being on the road, Lyndon had to take a shit and piss so badly, that he blackjacked as soon as he got in the bathroom.
by Poncho23 March 05, 2016
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".
- Hey pal, I'd like to buy a blackjack.
- Ight, it'll be 100$.

I smoked that blackjack all by myself!!
by Poulin La-Terreur September 19, 2011
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.
person 1: Do you like 2ne1?

person 2: Hell yeah I'm a total BlackJack!
by omgitsshelbyy December 03, 2010
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.
1. Girl, "My boyfriend gave me a blackjack last night."
Friend, "Really? How was it?"
Girl, "Not bad, but I got some corn in my eye."

2. Frat Guy 1, "Hey Bra, remember that time that I totally blackjacked you? That was awesome."
Frat Guy 1, "Yeah Bro! That shit ruled!"
by Captain Hot Pocket October 25, 2008
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.
Blackjack is also called twenty-one.
by Ed April 05, 2005
Actually the low house advantage comes from knowing the precise mathematical combinations of the cards. If you don't know them, you might as well be wasting your money.
Blackjack is not as easy as AYB is trying to say it is.
by Jared November 02, 2003
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