@vahnj The closest available Japanese meme for awoo is アオーン, the sound effect of Kagerou Imaizumi's howl as first heard in Stage 3 of Touhou 14: Double Dealing Character (although the phrase can also imply generic howling sound, so can awoo). The awoo meme originates from Momiji Inubashiri, who does not have a howling sound effect, back in Stage 4 of Touhou 10: Mountain of Faith. Both are illegal.
http://www.pixiv.net/tags.php?tag=アオーン
http://seiga.nicovideo.jp/tag/アオーン
@Nine *fines and baps, then fines more* Naughty citizen of awoospace!
@typhlosion Committing Awoo is now illegal.
Transparency Announcement: The admins of awoospace is using your fine money to pay off their own fine. @vahnj especially.
@noiob me, the awoo police: *fines*
@thefishcrow And don't awoo hun <3
@inurashii It brings me power and responsibility.
@eurasierboy @dont *nodnod* Koo~!
@NthTensor @emojispells #dont use my name like a hashtag
I'm patiently waiting for Rowletbot to awoo. I doubt such a day would ever come. @rowletbot
@inurashii People here awoo without regards to this sign!
@NthTensor @t54r4n1 Thank you for your report, the incident has been recorded.
And a warning sign, @starkatt
Follows = List of Suspects