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Backdraft

The odor cloud that hits an unsuspecting person when they open their office door after a co-worker has farted in it.
"I now always stick my nose under my office door and check the air, as to avoid being the victim of a backdraft."
by Scullnick July 31, 2012
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backpack inversion

a fun game invented by the high school marching band drummers of berlin, ct (also sometimes practiced by Berlinites or a combination of both). basically involves the following procedure:

1: Aquire someone's backpack while they are not looking
2: Remove the contents of the main pouch carefully, being sure to keep everything in the same order (or disorder) as it was found
3: Flip the backpack inside out
4: Put the contents of the backpack back into the now inverted backpack
5: Zip it up and put it back where you left it

the victim of this pointless and rather humorous attack will be most suprised when he/she turns around and finds their backpack flipped inside out. the same attack can be practiced by taking the backpack from their hands and using force to keep the victim away, however, must be accompanied by continuously repeating the phrase "just let it happen.."
shmope: dude, let's do a backpack inversion with dome's backpack.
shmope's friend: ok!
*inverts backpack*
dome: wtf, you guys suck.
mike: hahaha, dome has a big head.
by shmope's friend June 11, 2006
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backdate

When you have a school project that you were told about six months ago, but you did it the night it was due, you backdate it by putting dating a day from earlier to make it seem like you've been working on it for a while. Also very useful when you're doing an assignment the day its due.
Joe had just finished his history paper second period on the day it was due; in the heading, he backdated it a week so that the teacher would believe he didn't do a half-ass job on it.
by g_oo_gle May 2, 2005
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Backhand-invite

To invite someone to an event after telling them about it and not inviting them the first time.
I can't believe this bitch backhand-invited me to her birthday party!

I had to backhand-invite Sheila to my party. I assumed she would come when I was telling her about the plans weeks ago.

Damn! Now I have to backhand-invite my roommates to my party!
by Brischenda December 5, 2009
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Backpacker

A Backpacker has NOTHING to do with an over obsessive love for the Hip-Hop label Definitive Jux nor are they in any way associated with Hipsters. A Backpacker is just a person who think Rap and Hip-Hop are two different genres. Thinking Rap is about self indulgent wanna be gangstas with a need to show of their shopping list and contribute nothing to the music industry but their idiotic "thug life" ideals. They put all forms of support into Hip-Hop and just love good music in general.

They also love all/participate in all/most sub-cultures of Hip-Hop including the main five elements: Emceeing, DeeJaying (Turntabilism), Graffiti, B-Boying (Breakdancing), and Beatboxing.

And a Backpacker has nothing to do with a persons skin color. Its ignorance like that that belittles the social advances of the last 30 years. Stop listening to your racist redneck father.
Hip-Hop head conscious of the corrupt Rap world = Backpacker
by The Real Jink July 29, 2008
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Baltimore Backdraft

This grotesque act takes place when one individual deficates into the funnel while the other individual blows into the tube at the end of the funnel. When the feces is blown back to the other partners anus, it is known as the Baltimore Backdraft.
Due to her incredible lung capacity, she was able to send crap all the way to the ceiling, making me think twice before preforming the Baltimore Backdraft again.
by cubsfan0147 October 15, 2009
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backdraft

An explosive surge in a fire produced by the sudden mixing of air with other combustible gases. This is caused by a condition in a fire where oxygen is depleted and the fire dies down until a door is opened and the fire flares violently from the sudden intake of oxygen. Backdraft can be described as a small explosion.
The most common tactic used by firefighters in defusing a potential backdraft is to ventilate from the highest point, allowing the heat and smoke to escape without igniting explosively.
by Ryan Carpenter October 14, 2006
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