First of all, japanese wannabe means a person that tries to be a japanese. They will try to speak some japanese when they see japanese, or even try to show it off to some of their friends.
Japanese Wannabe A : Watashiwa Yukari Chiuzibai!!

Japanese : Kuso!! Go and learn ur own language properly before u learn japanese buddy.

Japanese Wannabe B : Hello, I am from Japan (actually from china or some other asian countries) Nice to meet u all.. Kawaii people!

Japanese Wannabe C : Lets take some pics!! ( posing in a very ridiculous face that he/she thinks is cute )
by Anti - Wannabe September 16, 2006
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