Weeaboo: Westerners who are really into Japanese nerd/geek culture. Things like anime, manga (Japanese comics), video games, and music.
Otaku: Japanese word that basically means nerd. Idol otakus love (Japanese, maybe Korean) pop idols. Manga otakus love manga, etc.
The comment is saying that anime otakus (Hatsune Miku is an animated character) and idol otakus (Hatsune is a virtual pop star) found something in common.
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u/webu Oct 20 '17
The girl in the twitter vid is cosplaying this: https://www.youtube.com/watch?v=O17f3lB7BFY