Wapanese is a word that has been argued about many many times. It is commonly known as a white person who wants to be japanese.
Someone who watches anime, listens to japanese music and draws manga from time to time but also has a social life, bf and respects there own culture like myself can be classed as someone who has interest in the culture.
Wapanese on the other hand display some of these unhealthy obsessions:
They try to dress harajuku/lolita by applying mountains of makeup and mixing up clothes which makes them look like they are in drag or a wannabe emo.
Watches 2 episodes of an anime and instantly becomes obssessed and brags about it to everyone they know.
Overuses japanese phrases online and in real life.
On youtube they comment japanese music videos with such things as 'omgz ruki looks so kawaii <3~~!!'.
They add any random japanese people on myspace hoping to make some japanese friends and litters them with japanese phrases.
They think the terms 'visual kei' and 'oshare kei' are some kind of religion.
If someone in some way insults japan, they themselves also feel insulted.
They learn one hiragana/kanji/katakana phrase and begin drawing it all over there books/work...
They watch anime such as pokemon and think its 'uber cool'.
For the girls there idol is Gwen Stefani.
They change there names to some japanese name and tells everyone to start calling them that.
They think making the peace sign makes them look japanese.
Anything that looks remotely japanese they go mental for, even if its a wall scroll that is in chinese they still go mad for it.
I could go on for ages but these are the things i have witnessed in the past in the 'wapanese'.
Guy: Hey just finished watching fushigi yugi, its pretty immense, what do you think?
Wapanese: OMGZ thats like THE BEST ANIME EVER, so kawaiii! isnt tamahome so uber smexi!
Guy: Errr, what did you think to the ending?
Wapanese: Well, err i think you need to fill me in, bad memory you see :)
Guy: You havent watched it have you...
Wapanese: Yeh well but its still proper awesomeeeee!!