When someone purposefully enters 10 incorrect passwords into your blackberry, causing it to erase all of the information stored on the device.
Tommy: Oh shit! Last night when I was hammered, someone erased everything from my phone!

Franky: Damn man, you got blackjacked!
by TurkishandTommy April 20, 2011
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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 November 30, 2015
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Masturbating when in a state of black out drunkeness.
I must have been blackjacking last night because i woke up with my dick in my hand.
by Stank Twatwell December 12, 2009
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When you skip work to go to the casino and gamble.
Dan couldn't make it to work on Thursday. He had a bad case of blackjackitis.
by Ryguy639 September 7, 2018
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a small, light club used for knocking people out
by The Wraith November 6, 2003
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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
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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 3, 2010
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