Green’s Dictionary of Slang

(US) one who is obsessed with Japanese culture, e.g. manga.

2011		Urban Dict. 16 Apr. 🌐 Weeb A one-syllable contraction of "weeaboo", which is Internet for ‘wapanese’. No, I don't collect animu figurines! What kind of weeb do you think I am?
2016		C. Eble (ed.) UNC-CH Campus Sl. Spring 2016 11: WEEB — non-Japanese person obsessed with Japanese culture. Also WEEABOO, WAPANESE (<wannabe Japanese), ANIME TRASH.