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9.
Boosting is when you have a turbo car & you boost it by accelerating and it increases your speed twice as fast or more than if you had a naturally aspirated car. It's so much fun hitting boost & everyone looks at ya car when ya boosting it.
(Driving down the main straight of town & *Jamie yells out the window of his N/A Subaru RX)

"Stop boosting your car, it makes my lil 4 cyl rice burner look like a bagger".

(Me)"My car has boost, I can't help that Im constantly boosting it. It's fun!"
by Amanda572 January 22, 2008
 
1.
In multi-player games, having other people assist you in getting leaderboard position or achievements (xbox 360 specific) by having other people help you in ways that go counter to the game's design. Most often done with one team throwing the game to another.

Example: In Battlefield:Modern Combat, one Achievement acquired by hitting 5 enemies and 0 friendlies in one mortar strike. This is doable but, during normal play, exceptionally hard. Boosting would be getting 5 people you know to join the other team and all stand in one place so you could drop a mortar strike and get the achievement.
Getting to the top of this leaderboard is a joke. The only people on there did it by boosting.
by Ioshua August 22, 2006
 
2.
In online video games, mostly FPS, it is where players will try to pad stats or earn exp as quickly as possible. For example, in Modern Warfare 2, people will play Search and Destroy or Free for All with other people and just let each other get a lot of points off of each other, thus ranking them up higher. In other games, such as Halo 3, people will boost for achievements. Boosting is looked down upon because it shows that the person isn't skilled enough and/or too impatient to rank up the legit way. Basically, if you boost, you are a loser.
MW2 Booster: Ok so does everyone have a Riot Shield with Tactical Insertion and One Man Army on?

Other boosters: Yeah, we're ready.

Me: *runs around killing all the noob boosters while they don't suspect it*

Booster: Hey stop, we're trying to do something!

Me: You guys are losers for boosting. Get a life and play the game the way it was meant to be played!
by iduncurr January 18, 2010
 
3.
To steal and sell for profit
I was boostin the system out of some guys car when the cops started to come
by Justin Zelekovitz April 30, 2005
 
4.
Detroit slang for lying. or trying to so make people believe your bullshit. to make yourself seem better or cooler than a fuckboy, or bitches do it for attention. boosting is usually some shit you know they aint do and they kno they aint do it either.

you should never listen to a booster, always call them out on their boosting.
fuckboy: hell yeah we was at the room downtown blowin a whole zip of that loud shit. and i dropped bands on three bottles of rose. And all the hoes was choosing when they seen me lookin sleezy off the True fit wit the pradas.

boy: nigga quit boosting. how the fuck u gone blow a zip in the room. and me an my mans saw yo broke ass get off the DDOT yesterday u was tryna buy some reggies.
by 7mileOG March 11, 2014
 
5.
Boosting is the act of a user speeding up the process of gaining awards or experience in video game, typically a First Person Shooter in an online Multi-Player setting, by using methods that are not supported by the game developers and the online community. These methods include the user having one of his friends joining the opposite team and letting the user kill that friend multiple times to gain experience and kills at a faster rate than normal.
Jeff is on team A and gets his friend John to join team B. John lets Jeff kill him repeatedly so that John can "Level-up" faster. Jeff is "boosting" because John is helping him "boost" his level and statistics.
by bracketeering August 11, 2011
 
6.
Usually on Xbox 360, is a way gamers use to obtain several achievements in a short period of time by using teamwork, glitching, or whatever means necessary to accomplish diffcult achievement criteria.
friend1: Man i need at least 1000 kills on this game for the achievement but its taking too long, what should we do?

friend2: Easy! We can invite all of my friends to join a match. They can just sit there while u kill them over and over for easy kills!

friend1: So you mean boosting?

friend2: Yup my friends have all the achievements anyway!
by SpazPownrOr7z December 21, 2012
 
7.
To steal and profit from it.
I went from boosting xboxs to living in a pent house.
by Master Of Life January 02, 2011