Best definition
a weabou is someone who over-indulges in Anime. sometimes so much so that they begin worshipping it.

“You weabou, stop watching anime!”
weabou: define #2
When your white american friend acts japanese and watches more anime than he/she should.
Person 1: “Hey, did you watch that last epsiode of Naruto?

Person 2: No! I’m not a weabou like you!