1) A speed, or meth addict who has assumed the role of the drug, in other words, they lost their personality to the drug.
2) An ex- deadhead or hippie who has fried their brain and is now living in the small, paranoid world of warped memories of a mundane adolescence. They communicate by spreading urban legends as "amazing" inspirational stories that align with their perception of reality.
3) A stupid, spastic teen (or adult, but less common) that display ignorance and naivety with every action.
I was walking through the Haight the other day and was surrounded by tweakers.

I went to my high school reunion and the tweakers were still messed up in the head.
by stv October 05, 2004
a person who has been awake,on average,for about 2 weeks without sleeping because they've been abusing speedy drugs(usually,but not limited to:crystal methamphetamine)
this tweaker told me the only cure for coming down is more drugs.
by insanegerbil November 22, 2003
A people who uses the drug methamphetamine. A low life piece of shit. Someone who will steal from you in order to score meth. Zombie like
I was watching the video "tweakers" by skinny mumbles on YouTube.

The tweaker beater mafia is coming to town to get rid of our cities meth problem.
by DirtyGiggles February 27, 2012
Someone who Messes around with more than one person.
Christina had sex 5 Guys Last Night. She is Such A Tweaker!
by Mizzjas1802 October 13, 2010
A Noun. A GIRL OR BOYTHAT IS KNOWN FOR SLEEPING WITH OR GIVES ORAL SEX TO PRACTICALLY THE WHOLE NEIGHBORHOOD.

A Noun. A GIRL OR BOY THAT IS KNOWN FOR SLEEPING WITH OR GIVES ORAL SEX TO NUMBERS OF PERSONS THROUGHOUT THE CITY.

TWEAKER IS USUALLY USED TOWARDS FEMALES, BUT IT IS NOT UNCOMMON TO USE IT TOWARD A MALE. BOYS ARE USUALLY CALLED THE "BURNING BOYS", THE EQUIVALENT OF "TWEAKER".
*SEE "BURNING" 2nd and 3rd definitions...*
JESSICA SIMPSON SLEPT WITH KIM KARDASHIAN'S BOYFRIEND REGGIE BUSH.

KIM -"Jessica slept with my boyfriend, and I heard that she slept with Common, Kanye, and Usher, and gave Ray J, and Nick Cannon oral sex,... She is a TWEAKER!!!"
by ANCIENTCHINESESECRET93 May 18, 2010
Originated in Philadelphia

A female that has sex with a lot of males, possibly just to become popular of doing it because she feels like it.
If you let a boy and his friends have sex with you are considered a tweaker.
by briight April 06, 2010
a female that is a whore or has multiple sex partners. Originated in Philly; used in Philly and parts of Delaware.
Jon-ayo she a tweaker. da whole crew hit dat!

or
Jay-yo why did u and yo girl break up? she was fine!
Jon-yeah she was fine but she was a tweaker
Jay-aw man!
by lilmamapullin April 01, 2010

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