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40.
Someone who says they really like something when either
1: The barely know anything about it
2: They're only saying that to fit in

Posers usually all dress the same and think they're totally hardcore when really, they suck. Poser is becoming the new term for conformist, because most posers are only doing the annoying things they do to fit in.
EXAMPLE 1:
Poser: OMG I love Green Day!
Punk: What's your favorite album?
Poser: American Idiot.
Punk: Ha! Typical poser. I like Insomniac.
Poser: Wha? Is that a second name for one of their songs?
Punk: No, it's an album!
Poser: They have more albums???

EXAMPLE 2:
Poser: I have a girlfriend. *note: poser is a girl*
Non-Poser: So you're lez or bi or something?
Poser: No, I'm just expreimenting. That's okay in highschool.
Non-Poser: So you aren't attracted to girls but you're dating one?
Poser: Yeah, I love her. She's HOTT.
Non-Poser: You can't say that if you're not attracted to girls. It's faking it. You're a stupid poser. That's sick, it's not just a brand of clothes or something, you're probably breaking your "girlfriend's" heart, because you aren't really attracted to her. Get a boyfriend instead, or be single you fuckhead!
*note: I actually had that conversation with a stupid poser. Most of the posers I know pretend to be bi, and then they use the word "gay" as an antagonistic phrase.*

EXAMPLE 3:
Poser: I love My Chemical Romance!
Non-Poser: What's your favorite song?
Poser: Welcome to the Black Parade!
Non-Poser: Do you own any of the albums?
Poser: No, I just saw the video on TV! It was so cool... I love MCR <3333
Non-Poser: Have you ever heard "Cemetery Drive"?
Poser: No, I just heard them for the first time! My mom just bought me a MCR shirt!
by Oo_Vi_oO October 20, 2007
 
1.
1.one who pretends to be someone whose not.
2. who tries to fit in but with exaggeration

An Avril Lavigne fan

"Like oh my god! She is not pop, dammit! She is totally punk rawk!"
by pool May 15, 2003
 
2.
Any one who does not follow his/her own ideas of what he/she likes. Following no one set norm makes you real and following no one set norm makes you poser. Poser is governed not by the clothes, music, or makeup you wear, but rather by the state of your mind and the conformity to your own beliefs.
Posers conform to the beliefs of others.
by Alive June 23, 2003
 
3.
A person who attempts to blend into a specific social group.
Justin was such a poser-goth; sure, he comes to school in all black, but he doesn't even know who Edgar Allen Poe is.
by Paul Cannon October 01, 2002
 
4.
a person - usually in middle or high school, who is insecure about him/herself and trys very hard not to be a "conformist" or a "prep," by doing things like: purchasing a skateboard or guitar, purchasing a great deal of clothing and accessories from hot topic, and listening to pop-punk bands such as simple plan, yellowcard, etc. usually, this supposedly "nonconformist" behavior just backfires on him/her, because now he/she is still conforming, just to a different group of people. so the moral of the story is to be yourself.
some people are posers.
by purple_stain69 February 20, 2005
 
5.
Someone whos acts like someone theyre not,but not realizing that there being fake, basically a loser trying to fit in.
A poser green day fan,this applies to other poser bands--
Todd:have you heard american idiot?Thats the bestest song ever!
Bill:Have u even heard any other green day songs?
Todd:what other green day songs?
by hi February 14, 2005
 
6.
A poser is someone who tries hard to be something they arent. Usually, posers call other people posers because they are jealous that the person they called a poser is more skater/stoner/goth/punk/rocker/grunge/etc. than they will ever be.
Summer.
by Mary Mariegh June 21, 2003
 
7.
One who attempts to appear to others as something they are not, especially by their manner of dress; a charlatan.

also 'poseur'
Take off that gold chain Julio, you're such a fucking poser!
by Tracey December 28, 2003