"The booster" is what is left when you get down to the last 2 inches of malt liquor in a 40 ouncer, preferably Olde English 800 (better known as "Eight Ball"). By the time you get down to the booster it is usually warm, which only serves to make an already unpalatable beverage taste even worse. Despite the nastiness of the booster, it must be consumed to avoid ridicule by one's peers.
Hey you donkey, are you gonna drink that booster or are we gonna have to put a skirt on you and buy you a box of tampons?
by The Slow Kid June 05, 2006

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A side girl and or a little thot
Aye Chris, I hope you know she a booster.
by Foreign.king July 09, 2016

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Saying you will do something, but when it comes down to it you back out of it.
Person 1: Lets go out to eat!
Person 2: Okay, sounds like a plan!
*before leaving*
Person 2: I'm about to pick you up.

Person 1: I don't want to go anymore.

Person 2: You're such a booster.
by Anabsj January 05, 2015

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Another dose of a drug consumed later after the first dose, but before the effects of the first wear off. Hence, boosting the effects of the drug back up to a high. Normally it is a lower dose, because not as much is required to bring the high back.
After I started coming down from my high, I needed a booster so I did another two lines of coke and felt much better.
by dinnerplates January 13, 2008

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a female who steals stuff, often for pimps.
Lloyd Banks "Just Another Day" -- I got a Houston ho - nah she ain't the sharpest knife in the drawer but she a damn good booster though.
Cam'Ron -- "I get the boosters boosting."
by azzy March 06, 2005

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when a guy gets led on by a girl, thus boosting her confidence up, so she can get with another guy who shes likes as well in the process.
Stacy: "Frank, i like you and youve made me feel really special, but i think a like another guy more. Therefore we should only remain friends"
Frank: "Stacy, i really liked you. thanks for using me as a fucking booster. Whore"
by AAACCCCCHHHHILLLLEEEUUUSSS February 03, 2009

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When a rapper or hip hop producer samples or loops an older track. This is known as "Boosting a track." This may also refer to when another beat is played over a vocal track in a club.
The beat on Notorious B.I.G.'s "Juicy" was "boosted" from a classic R&B track.

"Even your club record need a booster" - Common

"You boosted the record, then you looped it you looped it" - 3rd Base
by 4DAZE September 21, 2009

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