To take the bag off a Volcano vaporizer before it's fully inflated, take a quick hit without turning off the air switch, and quickly put it back to be inflated fully for the person who requested it.
Ralf asked Florian to get Ralf high off a Volcano bag, but Florian was cool with it because he was able to bag-jack a monster hit for himself.
by One Hit March 11, 2013
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the act of stealing Halloween candy from children while they are trick-or-treating.

Origin: SNL Weekend update Oct. 15, 2011. Rap star Drake and SNL member Jay Pharoah pose as "Teens Dressed as Werewolves" and do a rap song about 'bag jacking'
Me and my friends tried to go bag jacking this Halloween, but all of the kids went out with their parents.
by Yuehan85 October 16, 2011
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1. n
Simply, a bag or rag or magazine or anything container outside a bathroom that you shoot your load into when your done jacking off.

2. adj
term used to describe someone who's only worth is being there to absorb your masturbation
1. I'm using this plastic bag as a jack bag

2. "Alright, jack bag, you don't have to yell"
by Jack MeHoff January 14, 2004
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n-Jack bag-a military issued sleeping bag that deployed soldiers sleep in and masturbate in before going to sleep at night thinking about their bitch back home or due to the absence of woman. THis sleeping bag can become very foul throughout the course of a deployment. So be weary next time you shop for a used sleeping bag at the Army surplus store.
Friend #1: "Hey if we are going camping I need to borrow a sleeping bag"

Friend #2: "Yeah I have one you can borrow. I slept in this one when I was deployed to Afghanistan"

Friend #1: "FUCK NO!!!! I aint sleepin' in no Jack bag}!!!!"
by Nasty Loogy June 13, 2007
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n. A term formed from the better sections of the terms "jack-off" and "douche-bag". Refers to a person who generally exhibits the traits of above terms, usually at abnormally high levels.
"Hey jack-bag, for the last god-damn time, get your hands off my sandwich!"
by Buck Stuck February 4, 2004
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1. A man purse or messenger bag. The bag a male uses to keep all of his stuff in. Commonly used for work or school.

2. The ass kicking bag that Jack Bauer uses to single handedly pwn terrorists.
{man one} haha dude that is such a murse.
{man two} HELL NO! thats my Jack Bag!
by Curly Curtis 813 March 24, 2009
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The plastic Bag filled with Cocain, that Coke heads use to reach their euphoria.
Darrell Strawberry stole Robert Downey Junior’s “Jack-Bag” in the 90’s, and used some of the Yay-O to do a bump out of Brooke Shields flat ass. #Classic
by SwingMan23 February 4, 2019
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