What does something like 'ウオエエエエエ' express?


The context is that the character was in the middle of a long winded speech
about something, then noticed their friends weren't paying attention, and got
a super annoyed looked on their face, like
[this](http://tn.smilevideo.jp/smile?i=30363571.L), before making the sound.
Anyone know? Because Google and my usual sources turned up extremely little




Translating @Chocolate 's comment, I believe she's saying **it expresses the
sound of one vomiting**.




Translating @Chocolate 's comment, I believe she's saying **it expresses the
sound of one vomiting**.

