people who wish they were Japanese/think they are Japanese because they read manga, watch anime and know/use Japanese words they catch from anime. its cringey as fuck.
https://www.youtube.com/results?search_query=cringe+weeaboos
pick a video to watch, you'll understand.
It's a word people made up to feel superior to others. Here's an example.
'Uuh that person is always reading manga and watching anime, I mean we do that too but when they do it it's so lame, they're such a weeaboo'.
'You're right, we are so superior and better than that person, we have an interest in Japan too but when that person does it it's so cringey ewww'.
'haha, aren't we the best?'
'hahahha, yea we totally are'.
Below my comment is I think a weeabo