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1.Similar to the 'instafan'. Someone who takes a look at a Japanese band and instantly likes them for the way they look. They don't even listen to the music, which is what a band is about, even if they're visual key, listen to the music also people.

2.Someone who poses as a Japanese person. Loving everything to do with Japanese, when in reality they're just doing it because the crowd is doing it.
1. Random girl: I love Dir en grey, they're all so cute! :annoying squeal:
Random actual fan: Man, you're such a Japoser, listen to the freakin music before you even consider talking to me about Dir en grey.

2. Look at that Japoser over there, she didn't start dressing as a lolita until the Japanese crowd did.
Japoser by Tweetybird April 17, 2006
Related Words
Some fag on AIM Chats who says things like 'bai' or <.<, trying to be AZN and cool or somthing. Its really gay.
Konichiwa!!! <.< Lyk hai sLip-kun.
japoser by sLip May 3, 2004
Anybody who tries to be Japanese and listen to Japanese bands, such as Dir En gay, the most faggot-like band Ever.
" Omg KYO FROM DIR EN GREY IS SO KAWAII KEKEKEKKE ^________^ BAKA "
Japoser by Leon May 8, 2004

japoseur 

A person who thinks that they're fluent in Japanese when they only know four words.
"UR A BAKA" "SUGOI!! *^-^*" or "KAWAII!!! KEKEKEKE"
japoseur by Jamie March 28, 2004

japoseur 

A person who pretends to be japanese, and is not, or knows very little of japanese culture or language.

"Azn" "Otaku"
" 'AznBoi69'is such a japoseur."
japoseur by NormalBoy July 26, 2003
A combo of the words "Japan" and "laser". A Japser is a weapon used in 2250. Japsers were created by the Japanese after Earth was taken over by the Irkens (ref- Invader Zim). First sed in GalaxyDancer's fanfic "Down Came The Rain" (www.fanart-central.net/stories.php?sid=11875)
"But it doesn't matter now, because I'm never going back. Ever. I will kill myself with a Japser first."

~Zim
Japser by GalaxyDancer April 16, 2005