The story
Blend of wannabe + Japanese, originally first invented in 2002 as an internet slang for a non-Japanese person who is unhealthily obsessed with Japanese culture.
Etymology from Wiktionary, CC BY-SA 4.0.
wapanese
Today it means: Synonym of weeaboo: a person from elsewhere, particularly an unsocial white male, considered overly infatuated with Japanese culture. Full definition →