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1. the long form of hello, normally used on internet chats like IRC. 2. The call sign of the llama fraternity. 3. The noise an evil animal makes, any animal; but especially crazy ones that aren’t known to make any other noise. So a sheep will not go mwaaa, but a moose might. 4. (if used with more a's, like mwaaaaaaa)The noise teenagers make while dieing of boredom.
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